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Cystoscopy

Cystoscopy is a diagnostic and therapeutic endoscopic procedure that involves inserting a thin, flexible or rigid tube equipped with a light and camera, known as a cystoscope, through the urethra to visualize and examine the interior of the bladder and urethra.^[1] This minimally invasive technique allows healthcare providers to identify abnormalities such as inflammation, tumors, stones, strictures, or blockages in the lower urinary tract.^[2] Performed by a urologist, cystoscopy can be conducted in an outpatient setting using local anesthesia, sedation, or general anesthesia depending on the patient's needs and the procedure's complexity.^[3] The primary purposes of cystoscopy include evaluating symptoms like blood in the urine (hematuria), frequent or painful urination, and recurrent urinary tract infections, as well as assessing conditions such as bladder cancer, prostate enlargement in males, or urethral narrowing.^[2] Beyond diagnosis, it enables therapeutic interventions, including biopsy collection for tissue analysis, removal of small bladder stones or tumors, stent placement to relieve obstructions, and injection of medications directly into the bladder wall.^[1] Flexible cystoscopes, which are bendable and often used for routine diagnostic exams, allow for greater patient comfort and can be performed without sedation in many cases, while rigid cystoscopes provide enhanced precision for surgical tasks and typically require anesthesia.^[3]

Overview

Definition and Purpose

Cystoscopy, also known as cystourethroscopy, is a diagnostic and therapeutic endoscopic procedure that enables direct visualization of the urethra, bladder, and adjacent structures such as the urethral sphincter, prostate in males, and ureteral orifices.^[4] It involves the insertion of a cystoscope—a thin, flexible or rigid tube equipped with a light source and camera—through the natural opening of the urethra into the bladder.^[2] This allows healthcare providers, typically urologists, to inspect the mucosal lining and internal anatomy in real time.^[3] The primary purpose of cystoscopy is to diagnose conditions affecting the lower urinary tract, including hematuria, urinary tract infections, bladder stones, and malignancies such as bladder cancer, by providing detailed images that guide further evaluation.^[2] Therapeutically, it facilitates minor interventions, such as taking tissue biopsies, removing small stones or polyps, or injecting medications directly into the bladder wall, often during the same session.^[3] These capabilities make it essential for both initial assessment and follow-up surveillance in urologic care.^[5] Unlike non-invasive imaging modalities such as ultrasound or computed tomography (CT) scans, which offer external or cross-sectional views based on sound waves or radiation, cystoscopy provides an immediate, high-resolution internal perspective without requiring surgical incisions.^[4] This direct access distinguishes it by enabling interactive examination and simultaneous treatment, which indirect methods cannot achieve.^[2] As a minimally invasive outpatient procedure, cystoscopy typically lasts 5 to 30 minutes depending on whether it is diagnostic or therapeutic, allowing most patients to return home the same day with minimal recovery time.^[3]^[5]

History

The history of cystoscopy begins with early attempts to visualize internal body cavities using primitive light-conducting devices. In 1805, German physician Philipp Bozzini (1773–1809) invented the Lichtleiter, a basic endoscope consisting of a tin tube with a light source—typically a wax candle or alcohol lamp—directed through mirrors to illuminate areas like the urethra, bladder, rectum, and cervix.^[6] This device, while innovative, was limited by poor illumination, heat generation, and lack of magnification, and it faced criticism from medical authorities, leading to its suppression; Bozzini died young without seeing widespread adoption.^[7] Despite these shortcomings, the Lichtleiter laid the conceptual groundwork for endoscopy by demonstrating the feasibility of internal illumination and viewing.^[8] A pivotal advancement occurred in 1879 when German urologist Max Nitze (1848–1906), collaborating with instrument maker Joseph Leiter, developed the first practical cystoscope. This rigid instrument featured an integrated lens system for direct visualization of the bladder, platinum wire illumination via an external battery-powered lamp, and a prism to project light distally, enabling clearer images without excessive heat.^[9] Presented publicly on May 9, 1879, by surgeon Leopold von Dittel at the Royal Imperial Society of Physicians in Vienna, Nitze's cystoscope marked the birth of modern urology as a specialty, allowing in vivo diagnosis of bladder pathologies like tumors and stones for the first time.^[10] Early models were diagnostic only, but iterative improvements, such as incandescent bulb integration by the 1880s, enhanced usability and spurred further refinements.^[11] The mid-20th century brought transformative technological shifts with the advent of fiber optics in the 1960s, which replaced rigid lenses with flexible bundles of glass fibers capable of transmitting light and images around curves. Pioneered by Basil Hirschowitz and colleagues, the first commercial fiber-optic cystoscope was introduced in 1960 by American Cystoscope Makers, Inc., offering improved maneuverability and reduced patient discomfort compared to rigid scopes.^[12] Building on this, flexible cystoscopes emerged in the 1970s; Japanese urologists Akira Tsuchida and Hiroyuki Sugawara developed the first such instrument in 1973, incorporating steerable tips and fiber-optic channels for biopsy and minor interventions, expanding cystoscopy beyond pure diagnostics.^[13] By the 1990s, digital and video cystoscopes revolutionized the field, with charge-coupled device (CCD) cameras at the scope tip enabling high-resolution imaging displayed on monitors; companies like Olympus introduced these systems in the early 1980s, but widespread digital adoption in the 1990s allowed for recording, teaching, and precise therapeutic procedures like tumor resection.^[14] These evolutions profoundly impacted urology by transitioning cystoscopy from a solely observational tool to a versatile platform for therapeutics, such as fulguration and stone removal, thereby minimizing the need for invasive open surgeries and improving outcomes for conditions like bladder cancer.^[15] Seminal contributions, including Nitze's foundational design and fiber-optic innovations, remain highly cited in urologic literature for enabling minimally invasive care.^[16]

Relevant Anatomy

Male Urinary Tract

The male urethra serves as the primary conduit for cystoscopic access to the bladder, measuring approximately 20 cm in length and divided into three main segments: the prostatic urethra, which passes through the prostate gland; the membranous urethra, a short 1-2 cm segment traversing the pelvic floor; and the penile (or spongy) urethra, the longest portion extending through the penis from the bulb to the external urethral meatus.^[17]^[4] The prostatic urethra is surrounded by the prostate gland, a walnut-sized organ located inferior to the bladder, which encircles this segment and can influence urethral patency; benign prostatic hyperplasia (BPH), common in older men, often leads to urethral narrowing in this area, potentially complicating scope navigation during cystoscopy.^[4]^[2] During cystoscopy, the instrument follows the urethral path starting at the external meatus on the glans penis, advancing through the penile urethra (characterized by its distensible spongy tissue), crossing the narrow membranous urethra, navigating the prostatic urethra (where landmarks like the verumontanum—a posterior ridge housing ejaculatory duct openings—may be visualized), and entering the bladder via the bladder neck.^[4]^[18] This longer male urethral trajectory, compared to the female counterpart, typically extends procedure duration and requires careful angulation, particularly around the prostate to avoid trauma.^[4] Once inside the bladder, cystoscopy reveals key internal structures, including the detrusor muscle—a smooth muscle layer forming the bladder's thick wall that enables contraction for voiding—and the trigone, a triangular mucosal region on the posterior bladder base bounded by the two ureteral orifices and the internal urethral opening.^[19]^[4] The ureteral orifices, located 2-3 cm apart on the trigone, appear as slit-like openings during distension, allowing visualization of urine efflux and assessment of their patency, while the surrounding mucosa exhibits a normal vascular pattern in healthy states.^[4]^[18]

Female Urinary Tract

The female urinary tract, comprising the urethra and bladder, presents distinct anatomical features that influence cystoscopy procedures. The urethra measures approximately 4 cm in length and functions as a single, undivided tubular structure extending from the bladder neck to the external meatus in the vulva.^[4] This shorter pathway contrasts with male anatomy, enabling relatively easier and faster instrumentation during cystoscopy.^[4] The bladder itself shares functional similarities with its male counterpart but occupies a pelvic position anterior to the uterus and adjacent to the posterior vaginal wall, with its base forming the trigone region bordered by the urethral opening and ureteral orifices.^[20] These vulvovaginal relations position the urethral meatus in close proximity to the vaginal orifice, facilitating potential microbial exchange.^[20] Anatomical considerations for cystoscopy in females emphasize the urethra's brevity, which permits swift bladder access but heightens procedural vulnerability to contamination. The short urethral length and its nearness to vaginal flora increase the baseline susceptibility to urinary tract infections among women, often necessitating pre-procedural urinalysis to rule out active infection; antibiotic prophylaxis may be considered for high-risk patients according to current guidelines.^[21] ^[22]^[23] This proximity allows vaginal bacteria, such as those from altered flora, to ascend more readily into the urinary system, a factor that underscores the importance of sterile technique in female cystoscopies.^[22] Cystoscopy also enables direct visualization of anatomical overlaps, including urethral diverticula—outpouchings of the urethral wall that may harbor infections or stones—and bladder distortions linked to pelvic floor dynamics. These diverticula, often identified via the cystoscope's luminal view of their ostia, arise in the female urethra's mid-to-distal segments and can mimic other pelvic symptoms.^[24] Pelvic floor weaknesses, such as those contributing to bladder descent, may alter bladder contour observable during the procedure, highlighting the interplay between urinary and supportive structures in females.^[25]

Indications

Diagnostic Uses

Cystoscopy serves as a primary diagnostic tool for evaluating various urinary tract disorders by providing direct visualization of the urethra, bladder, and ureteral orifices. It is particularly indicated when non-invasive imaging or laboratory tests fail to identify the underlying cause of symptoms. Common diagnostic applications include investigating unexplained hematuria, recurrent urinary tract infections (UTIs), and persistent lower urinary tract symptoms (LUTS) such as dysuria or frequency.^[4]^[2]^[1] In cases of hematuria, whether gross (visible blood in urine) or microscopic (≥3 red blood cells per high-powered field on urinalysis), cystoscopy is essential to detect potential sources like bladder tumors, stones, or inflammatory lesions. For recurrent UTIs, it helps identify anatomical abnormalities contributing to persistent infections, such as diverticula or incomplete bladder emptying. Bladder pain syndrome, often overlapping with interstitial cystitis, warrants cystoscopy to assess mucosal integrity and exclude other pathologies through hydrodistension and biopsy. Urethral strictures, which cause obstructive voiding, are diagnosed via direct inspection of urethral narrowing, typically due to scar tissue or prior instrumentation. Evaluation of voiding symptoms, including incontinence or urgency, relies on cystoscopy to visualize prostate enlargement in males or structural issues in both sexes.^[4]^[2]^[1] Surveillance cystoscopy is routinely performed in patients with a history of bladder cancer to monitor for recurrence, with intervals determined by tumor grade and stage—typically every 3 to 6 months initially. It also plays a key role in assessing congenital anomalies, such as ureteroceles or duplicated ureters, which may present with recurrent infections or hydronephrosis detected on imaging. In differential diagnosis, cystoscopy distinguishes between inflammatory (e.g., glomerulations or Hunner lesions in bladder pain syndrome), neoplastic (e.g., via biopsy of suspicious lesions), and infectious causes by enabling targeted tissue sampling and ruling out mimics like carcinoma in situ.^[4]^[1]^[26]

Therapeutic Uses

Cystoscopy serves as a key platform for various therapeutic interventions in the urinary tract, enabling direct visualization and targeted treatment of abnormalities identified during the procedure. These applications extend beyond diagnosis to include resection, removal, and injection therapies, often performed under local or general anesthesia depending on complexity.^[4]^[2] One primary therapeutic use is transurethral resection of bladder tumors (TURBT), where a resectoscope passed through the cystoscope allows for the removal of superficial bladder tumors, aiding in both treatment and staging of non-muscle-invasive bladder cancer.^[4] This procedure is typically conducted in an operating room setting to ensure precise excision under direct vision. Bladder stones can also be managed therapeutically via cystoscopy, involving fragmentation with laser lithotripsy or mechanical extraction using baskets or graspers to alleviate obstruction and prevent recurrence.^[4]^[2] Urethral strictures are addressed through dilation or incision, such as direct vision internal urethrotomy, where a cystoscope guides a blade or laser to incise scar tissue, improving urine flow.^[4] Stent placement or removal is another common intervention, with ureteral stents inserted via the cystoscope to maintain patency in cases of obstruction from stones or tumors, often following diagnostic findings of ureteral issues.^[4] Biopsy procedures under cystoscopic guidance facilitate the collection of tissue samples from suspicious lesions for pathological analysis, ensuring accurate targeting to minimize healthy tissue damage.^[4]^[2] Additional therapies include foreign body removal, such as extracting migrated stents or calculi, performed safely under visualization to avoid complications.^[4] Fulguration, or electrocautery of bleeding sites, is utilized to control hemorrhage in conditions like hemorrhagic cystitis, where a cystoscope delivers targeted energy to coagulate vessels and evacuate clots.^[27] For urinary incontinence, particularly stress incontinence due to intrinsic sphincter deficiency, cystoscopy enables injection of bulking agents like calcium hydroxylapatite into the urethral submucosa to enhance closure and reduce leakage, with transurethral approaches preferred for precision.^[28]

Procedure

Types and Equipment

Cystoscopy employs two primary types of cystoscopes: rigid and flexible. Rigid cystoscopes are straight, non-bendable instruments typically used for operative procedures in a surgical setting, allowing the passage of larger instruments for biopsies or tumor removal, often under sedation or anesthesia.^[3]^[2] Flexible cystoscopes, in contrast, feature a bendable shaft that follows the natural curvature of the urethra, making them suitable for office-based diagnostic examinations with local anesthesia.^[3]^[2]^[4] The core components of a cystoscope include an optical lens system for visualization, a light source to illuminate the urethra and bladder, and channels for irrigation to distend the bladder with sterile fluid, enhancing visibility.^[2]^[29] Rigid cystoscopes utilize a Hopkins rod-lens system, which provides superior optical clarity compared to the fiberoptic systems common in flexible models.^[4] Many modern cystoscopes incorporate a digital camera that transmits video images to an external monitor, along with fiber optic or LED light sources for efficient illumination.^[2]^[29] Accessories enhance the functionality of cystoscopes during procedures. Biopsy forceps can be inserted through dedicated working channels—typically sized 4-7 French (Fr)—to obtain tissue samples from the bladder lining.^[2]^[3] Laser fibers, also passed via these channels, enable lithotripsy to fragment stones or ablate small tumors.^[2] Recent advancements in cystoscopy equipment include the development of disposable cystoscopes, which reduce infection risks associated with reprocessing reusable devices, and high-definition imaging systems that improve diagnostic accuracy through enhanced resolution.^[4]^[29]

Performing the Procedure

The cystoscopy procedure is typically conducted in an outpatient office setting using a flexible cystoscope or in an operating room with a rigid instrument, depending on the clinical needs and equipment availability.^[4]^[2] The entire process generally lasts 5 to 20 minutes for standard diagnostic examinations.^[30]^[2] Patients are positioned to facilitate urethral access, with the lithotomy or frog-leg position commonly used for rigid cystoscopy, where the individual lies on their back with feet in stirrups and knees bent.^[2]^[4] For flexible cystoscopy, a supine position suffices, allowing greater patient comfort.^[4] The cystoscope is lubricated prior to insertion to minimize friction.^[4] Insertion begins with gentle advancement of the cystoscope through the urethral meatus, progressing gradually along the urethra toward the bladder.^[4]^[30] In males, the penis is stabilized by grasping it with the non-dominant hand—using a five-finger hold for rigid scopes or a pinch grip for flexible ones—while accounting for the longer urethra (approximately 20 cm).^[4] In females, the shorter urethra (about 4 cm) permits simpler insertion, often directing the scope anteriorly with an obturator for rigid instruments or active deflection for flexible ones.^[4] Continuous irrigation with sterile fluid, such as saline, is maintained during advancement to distend the urethra and bladder, enhancing visibility by clearing debris and expanding the mucosal surfaces.^[4]^[30] Once inside the bladder, a systematic examination ensues, beginning with inspection of the prostatic urethra in males for structures like the verumontanum and potential obstructions.^[4] The bladder interior is then surveyed methodically: the anterior and posterior walls, dome, and lateral aspects using a 30-degree lens on rigid scopes or retroflection on flexible ones, followed by a 70- to 120-degree view if needed for comprehensive coverage.^[4] Particular attention is given to the trigone region and ureteral orifices to assess for efflux, inflammation, tumors, or other abnormalities.^[4]^[30] Withdrawal of the cystoscope occurs slowly after draining the bladder fluid, allowing re-inspection of the urethra and bladder neck en route to ensure no overlooked findings.^[4] This deliberate removal helps confirm the integrity of the examined structures.^[4]

Special Techniques

Blue light cystoscopy, also known as photodynamic diagnosis (PDD), enhances the detection of bladder cancer by utilizing photosensitizing agents such as 5-aminolevulinic acid (5-ALA), which is instilled into the bladder prior to the procedure.^[31] Upon illumination with blue-violet light (typically 375-440 nm wavelength), neoplastic tissues that have accumulated protoporphyrin IX—a fluorescent metabolite of 5-ALA—emit a red or pink fluorescence, making flat lesions like carcinoma in situ (CIS) more visible compared to standard white light cystoscopy.^[32] This technique, first described in 1994, significantly improves the identification of non-muscle-invasive bladder cancer (NMIBC), with studies showing CIS detection rates of 91-97% versus 23-68% under white light.^[33]^[34] Narrow-band imaging (NBI) represents another dye-free advancement in cystoscopy, employing filtered light in the blue (415 nm) and green (540 nm) spectra to enhance mucosal surface contrast and highlight abnormal vascular patterns indicative of malignancy.^[35] By selectively illuminating superficial capillaries and reducing hemoglobin scattering, NBI delineates irregular intrapapillary loops and increased vascular density in tumor tissues without requiring exogenous agents, facilitating real-time identification of both papillary and flat bladder lesions.^[36] Clinical evaluations have demonstrated NBI's superiority over white light in detecting recurrent NMIBC, with improved sensitivity for CIS and reduced recurrence rates post-resection.^[37]^[38] Integration of ureteroscopy with cystoscopy extends visualization to the upper urinary tract, allowing simultaneous assessment of the bladder and ureters or renal pelvis through a flexible ureteroscope advanced via the cystoscope sheath.^[1] This combined approach is particularly useful for evaluating suspected upper tract urothelial carcinoma or stones, providing a comprehensive endoscopic survey while minimizing the need for separate interventions.^[39] In contrast, virtual cystoscopy using computed tomography (CT) offers a non-invasive alternative, reconstructing three-dimensional bladder images from CT scans to simulate endoscopic views without instrumentation, though its sensitivity remains lower than traditional methods and it is not yet a direct replacement.^[40]^[41] These special techniques are primarily applied in oncology to augment bladder cancer diagnostics, thereby enhancing staging accuracy and reducing residual tumor risk after transurethral resection.^[42]

Preparation and Recovery

Before the Procedure

Patients preparing for cystoscopy should follow specific instructions to minimize risks and ensure the procedure's success. It is recommended to stay hydrated by drinking plenty of water in the days leading up to the procedure to help flush the bladder, unless otherwise advised by the healthcare provider. A urine sample is typically collected on the day of the procedure or shortly before to screen for urinary tract infections (UTIs); if an infection is detected, antibiotics may be prescribed, and the cystoscopy could be postponed until resolved. Additionally, patients are advised to inform their urologist about any allergies, current medications, or supplements, and to maintain good hygiene by taking a shower or bath beforehand, avoiding lotions, perfumes, or deodorants on the genital area.^[3]^[1]^[43] Certain medications, particularly blood thinners such as aspirin, nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen, or anticoagulants like warfarin, should generally be discontinued 5 to 7 days prior to the procedure to reduce bleeding risk, but only after consulting the prescribing physician to ensure safety. Patients taking these medications must discuss adjustments with their urologist, as the decision depends on individual health factors. No special dietary restrictions are usually required for office-based cystoscopy under local anesthesia, but fasting for 6 to 8 hours may be necessary if sedation or general anesthesia is planned.^[44]^[43]^[3] Anesthesia options are selected based on the procedure's complexity and patient needs, including local anesthesia via lubricating gel applied to the urethra for simple diagnostic cystoscopies, intravenous sedation for relaxation while remaining semi-conscious, or general anesthesia for more involved cases like biopsies or therapeutic interventions. The urologist will discuss these options during the pre-procedure consultation to address patient comfort and any potential need to upgrade from diagnostic to therapeutic during the examination. Informed consent is obtained after this discussion, covering expected findings, possible biopsies, and the rationale for the chosen anesthesia, ensuring the patient understands the process and any variations that may occur.^[2]^[1]^[3]

After the Procedure

Following a cystoscopy, most patients can return home the same day and resume normal activities within 24 hours, though recovery may take longer if sedation, general anesthesia, or a biopsy was involved.^[2]^[3] Immediate effects often include mild burning or pain during urination, small amounts of blood in the urine, and increased frequency or urgency of urination, which typically resolve within 1 to 2 days.^[1]^[2] To alleviate discomfort and flush the bladder, patients are advised to drink plenty of fluids, such as 16 ounces of water per hour for the first few hours post-procedure, and may use over-the-counter pain relievers like ibuprofen, warm baths, or a warm washcloth on the lower abdomen unless contraindicated by their healthcare provider.^[1]^[3] Monitoring during recovery focuses on signs of potential complications, such as infection, which may manifest as fever above 100.4°F (38°C), worsening pelvic pain, chills, or cloudy urine with a strong odor.^[2]^[1] Antibiotics are not routinely prescribed for uncomplicated cystoscopy. Periprocedural antibiotic prophylaxis may be considered for high-risk patients (e.g., those with a history of recurrent urinary tract infections, indwelling catheters, or immunosuppression), typically as a single pre-procedure dose, in line with American Urological Association guidelines.^[23] Patients should avoid driving for at least 24 hours if sedation or anesthesia was used, and heavy lifting or strenuous activities should be avoided for about 1 week, particularly if a biopsy was performed, to minimize bleeding risk.^[2]^[45] Follow-up care typically involves discussing procedure results with the urologist within 1 to 2 weeks, especially if tissue samples were taken for biopsy, as pathology results may take several days to a week to process.^[3]^[1] Patients should seek immediate medical attention if they experience severe symptoms, including inability to urinate despite a full bladder, bright red blood or large clots in the urine, intense abdominal pain, or persistent pain and burning beyond 2 days.^[2]^[1] These emergency signs warrant contacting the healthcare provider or visiting the emergency room promptly to prevent complications like urinary retention or infection.^[3]

Risks and Complications

Common Risks

Cystoscopy is generally a safe procedure, but patients commonly experience mild urinary symptoms following the examination. These include temporary dysuria, characterized by a burning sensation during urination, hematuria presenting as pink-tinged urine, and increased urinary frequency, all of which typically persist for 24 to 48 hours and resolve without specific intervention.^[2]^[3]^[46] Urethral irritation or bladder spasms may also cause discomfort, such as lower abdominal pain or cramping, which can be managed with medications including alpha-blockers like tamsulosin to relax smooth muscles or antispasmodics to alleviate spasms.^[3]^[47] Urinary tract infection (UTI) occurs in approximately 1-5% of cases, with a higher incidence in females due to anatomical factors; antibiotic prophylaxis may be administered if risk factors are present.^[48]^[49]^[3] The majority of these common risks resolve spontaneously within a few days, with intervention rarely required beyond supportive measures.^[2]^[46]

Serious Complications

Bladder or urethral perforation is a rare but serious complication of cystoscopy, occurring in less than 1% of cases, typically resulting from trauma caused by the cystoscope during insertion or manipulation.^[4] Symptoms often include severe abdominal or pelvic pain, hematuria, and difficulty urinating, and diagnosis may involve imaging such as cystography to detect extravasation.^[4] Most perforations are extraperitoneal and managed conservatively with catheter drainage for 24-48 hours, antibiotics, and close monitoring, though intraperitoneal perforations or those with significant symptoms may require surgical repair.^[4] Significant bleeding, or hemorrhage, can arise post-procedure, particularly following biopsy or tumor resection, with heightened risk in patients on anticoagulant therapy.^[50] This may manifest as gross hematuria or clot retention leading to obstruction, necessitating interventions such as bladder irrigation, transfusion, or fulguration in severe cases.^[4] Sepsis, a systemic infection stemming from bacteremia introduced during the procedure, is uncommon with an incidence of 0.1-1%, though the risk increases with therapeutic cystoscopies involving instrumentation or biopsy.^[4] Risk factors include preexisting urinary tract infections, immunosuppression, or diabetes, and symptoms such as fever, chills, and hypotension require immediate antibiotics and supportive care to prevent progression to septic shock.^[51] Other serious complications include anesthesia-related issues, such as allergic reactions, which are very rare (less than 1/10,000) but can present as anaphylaxis with cardiovascular or respiratory distress, managed with epinephrine and advanced life support.^[52] Urinary retention due to urethral or bladder swelling may occur, potentially requiring temporary catheterization, while blue light cystoscopy adds risks of photosensitivity reactions like photophobia or skin irritation, mitigated by avoiding sunlight exposure for up to 48 hours post-procedure.^[53] Patients should be monitored in recovery for these events, with prompt intervention to avoid escalation.^[4]

Veterinary Applications

Indications in Animals

Cystoscopy is indicated in veterinary medicine primarily for the diagnosis and management of lower urinary tract disorders in small animals, such as dogs and cats, where non-invasive imaging may be insufficient for definitive evaluation. Common indications include chronic or recurrent urinary tract infections (UTIs), where direct visualization allows identification of mucosal inflammation, bacterial plaques, or structural abnormalities not fully appreciated on ultrasound or radiography. Hematuria of unknown origin is another frequent reason, enabling inspection for sources like bladder polyps, clots, or vascular anomalies. Urolithiasis represents a key indication, as cystoscopy facilitates the assessment of stone location, size, and composition through direct observation and targeted biopsy or retrieval for analysis, surpassing the limitations of imaging in distinguishing stone types or associated mucosal damage. Suspected neoplasia in the bladder or urethra, such as transitional cell carcinoma, also warrants cystoscopy for early detection via endoscopic biopsy, which provides histopathological confirmation unattainable through less invasive means. Additionally, it is used to evaluate urinary incontinence or congenital defects, notably ectopic ureters in dogs, where visualization confirms abnormal ureteral insertion into the urethra or vagina. In dogs, cystoscopy is particularly valuable for investigating signs like pollakiuria (frequent urination) or stranguria (difficult urination), often linked to prostatic or urethral issues in males. For cats, it aids in diagnosing feline idiopathic cystitis (FIC), allowing assessment of bladder wall changes such as hyperemia or ulceration that correlate with clinical symptoms. Applications in large animals, like horses or cattle, are less common and typically reserved for specific cases of obstructive urolithiasis or trauma, due to anatomical challenges and the availability of alternative diagnostics. The diagnostic benefits of cystoscopy stem from its ability to provide real-time, magnified visualization of the urinary tract lumen, enabling targeted interventions like biopsy or stone manipulation that enhance accuracy over imaging modalities, which may miss subtle lesions or fail to differentiate inflammatory from neoplastic changes. This direct approach is especially critical in small animal practice, where it supports precise therapeutic planning and improves outcomes in complex urinary cases.

Procedures in Animals

Cystoscopy in veterinary medicine is adapted for animal patients, primarily dogs and cats, using specialized equipment to accommodate smaller anatomies and varying gender-specific urethral structures. Rigid cystoscopes ranging from 1.9 mm to 4 mm in diameter are typically employed for female dogs and cats, allowing transurethral access to the urethra, bladder, and vagina, while flexible urethroscopes of 1.2 mm to 2.5 mm are used for males due to the longer and more curved urethra.^[54]^[55] These scopes are selected based on patient size, with smaller diameters (e.g., 1.9 mm) for animals under 5 kg and larger ones (3.5-4 mm) for dogs over 15-20 kg, ensuring minimal trauma during insertion.^[54] General anesthesia is standard to facilitate patient restraint and cooperation, as sedation alone is insufficient for these invasive procedures.^[55]^[56] Techniques vary by gender and procedure goals, often incorporating vaginoscopy in females for enhanced visualization of the vestibule and broader vaginal access, which shortens the path compared to male urethroscopy.^[54] In male dogs, flexible scopes enable navigation through the os penis, while semi-rigid options (1.2 mm) are preferred for male cats post-perineal urethrostomy.^[55] For therapeutic interventions, such as stone fragmentation, cystoscopic-guided laser lithotripsy using a diode laser fiber (400-800 μm) is commonly applied, effectively breaking down uroliths in the bladder or urethra without open surgery; success rates exceed 90% in female dogs and most males when accessible.^[54]^[57] Recent advancements include the use of thulium fiber lasers, which generate less heat and use smaller fibers, enabling treatment in dogs as small as 7-9 kg (15-20 pounds) as of 2025.^[58] Cystoscopic-guided laser ablation has also been increasingly applied to intramural ectopic ureters in male dogs, with studies from 2025 reporting improved outcomes in continence.^[59] In cats, cystoscopy-assisted urolith retrieval via perineal urethrostomy (CUPU) has emerged as a minimally invasive option to avoid abdominal surgery, demonstrated effective in case series as of April 2025.^[60] Procedures are performed under sterile conditions, with patients positioned in lateral or dorsal recumbency and sterile saline infused for bladder distension and visualization.^[55]^[56] Diagnostic cystoscopies are often conducted in general veterinary clinics equipped with basic endoscopic setups, whereas therapeutic applications like lithotripsy are typically referred to specialty centers with advanced laser and laparoscopic capabilities.^[61] Post-procedure, animals require close monitoring in a recovery area, including frequent assessment of urination to detect dysuria or obstruction, along with pain management and an Elizabethan collar to prevent self-trauma.^[62] Challenges in veterinary cystoscopy include difficulties with patient restraint despite anesthesia, particularly in uncooperative or anxious animals, and the heightened risk of perforation due to smaller urethral diameters and delicate mucosal tissues, which can lead to complications similar to those in human procedures such as urethral trauma or stricture formation.^[63]^[54] Gentle advancement techniques and size-appropriate equipment mitigate these risks, though male cats present unique hurdles owing to their narrow urethra.^[61]^[55]

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Cystoscopy: Indications, Technique (Step by Step) and Complications
In men, the cystoscope is advanced into the urinary bladder under vision, and the urethra and prostate are examined at the same time with a 0° optical lens. The ...Normal Findings And... · Male Urethra · Bladder<|control11|><|separator|>
[19]
Anatomy of the Urinary System | Johns Hopkins Medicine
Urethra. This tube allows urine to pass outside the body. The brain signals the bladder muscles to tighten, which squeezes urine out of the bladder. At the same ...
[20]
Anatomy, Abdomen and Pelvis: Female Pelvic Cavity - NCBI - NIH
Jul 24, 2023 · Anterior to the uterus is the bladder, with rectum located posteriorly. Between the uterus and the rectum is the recto-uterine space, also ...Anatomy, Abdomen And Pelvis... · Blood Supply And Lymphatics · Surgical Considerations
[21]
Cystitis - StatPearls - NCBI Bookshelf
Acute cystitis is typically caused by a bacterial infection of the urinary bladder. Women are particularly susceptible due to the proximity of the rectum to the ...
[22]
Recurrent Urinary Tract Infections and Asymptomatic Bacteriuria in ...
Female gender is one of the main risk factors in the development of UTIs and AB, probably due to anatomical factors such as the proximity of the external ...
[23]
Urethral Diverticulum in Women: Retrospective Case Series - PMC
We describe the various clinical presentations of urethral diverticulum, which may mimic other pelvic floor disorders and result in diagnostic delay.
[24]
Bladder Prolapse (Cystocele): Symptoms, Diagnosis & Treatment - Urology Care Foundation
### Anatomical Relations of Bladder to Pelvic Floor in Females
[25]
Cystoscopic evaluation and clinical phenotyping in interstitial cystitis ...
We aimed to review, report, and discuss the role of cystoscopy and clinical phenotyping in interstitial cystitis/bladder pain syndrome (IC/BPS).
[26]
Hemorrhagic Cystitis Treatment & Management
Oct 3, 2022 · Fulguration of bleeding sites and biopsies of suspicious areas may be performed at that time.
[27]
Injectable Bulking Agents for Incontinence - Medscape Reference
Oct 31, 2023 · For transurethral injection, use a cystoscope with endoscopic injection setup to infiltrate collagen beneath the urethral mucosa. Insert the ...
[28]
Cystoscopy: Background, Indications and Contraindications ...
Nov 22, 2024 · Cystourethroscopy is contraindicated in febrile patients with urinary tract infections (UTIs) and those with severe coagulopathy.
[29]
Cystoscopy Periprocedural Care: Equipment, Patient Preparation
Nov 22, 2024 · A rigid cystoscope (see the image below) is composed of 3 parts: telescope, bridge, and sheath. The telescope transmits the light into the ...
[30]
Cystoscopy: MedlinePlus Medical Encyclopedia
May 17, 2024 · Cystoscopy is a surgical procedure. This is done to see the inside of the bladder and urethra using a thin, lighted tube.
[31]
Blue-light cystoscopy in the evaluation of non-muscle-invasive ... - NIH
It is thought that photodynamic diagnosis, by the use of a photosensitizing drug and blue-light cystoscopy, can improve the detection of tumor and therefore ...
[32]
Photodynamic Therapeutic Effect during 5-Aminolevulinic Acid ...
When the bladder is illuminated with blue light during cystoscopy, the cancerous tissues fluoresce (emit a red or pink light), making them more visible compared ...
[33]
Performance of Narrow Band Imaging (NBI) and Photodynamic ...
Aug 30, 2021 · The so-called “blue light cystoscopy”, also known as photodynamic diagnosis (PDD) fluorescence cystoscopy, was first described in 1964 [6] and ...
[34]
Fluorescent Light-Guided Cystoscopy with 5-ALA Aids in Accurate ...
Using photodynamic diagnostic (PDD) cystoscopy has been found to increase the CIS detection to 91–97% compared with 23–68% with white light [5]. Kata et al.
[35]
Cystoscopy Accuracy in Detecting Bladder Tumors - NIH
Dec 28, 2023 · This study investigates the accuracy of cystoscopy, a key diagnostic tool for bladder cancer, which is the 10th most common cancer worldwide.<|control11|><|separator|>
[36]
The vascular and morphological characteristics of tumors under ...
Nov 10, 2023 · NBI provides a clear visualization of blood vessels in the bladder. Due to their rapid growth and proliferation, malignant tumor cells require a ...
[37]
Narrow band imaging for bladder cancer - PMC - NIH
The authors concluded that NBI cystoscopy is highly valuable in the detection of both new and recurrent non-muscle invasive bladder cancer and a further ...
[38]
Usefulness of narrow-band imaging in transurethral resection ... - NIH
NBI aids in the identification of abnormal areas by delineating the vascular pattern more clearly. Studies are ongoing to evaluate its impact on the management ...
[39]
Effect of flexible cystoscopy combined with flexible ureteroscopy on ...
The combination of cystoscopy and ureteroscopy allows for a more comprehensive evaluation of stone location, size, and the presence of multiple stones.
[40]
Computed tomography-virtual cystoscopy in the evaluation of ... - NIH
Aug 23, 2013 · In conclusion, compared to CC, CT-VC is much less invasive, with minimum discomfort and risk for the patients, especially in that there are no ...
[41]
Emerging optical techniques in advanced cystoscopy for bladder ...
Studies have shown that it is feasible to perform a virtual cystoscopy, but at present the sensitivity is not sufficient yet to replace cystoscopy.
[42]
A Systematic Review and Meta-analysis of Photodynamic Diagnosis ...
Jul 22, 2021 · This review suggests that photodynamic diagnosis, compared with white light cystoscopy, improves recurrence-free survival in non–muscle-invasive bladder cancer ...
[43]
About Your Cystoscopy in the Operating Room
Nov 5, 2024 · Cystoscopy is a procedure that lets your healthcare provider look for problems in your urinary tract and bladder.
[44]
Cystoscopy Instructions - Stony Brook Medicine
Jul 2, 2025 · If you take aspirin, anti-inflammatory drugs (such as Motrin, Alleve, Vioxx, Celebrex etc.) or any blood thinners (such as Coumadin or Plavix).
[45]
Best Practice Statement on Urologic Procedures and Antimicrobial ...
Feb 1, 2020 · The AUA developed a multi-disciplinary BPS to guide clinicians on the proper usage of AP across urologic procedures and wound classifications.
[46]
[PDF] Rigid Cystoscopy - University Hospitals Sussex NHS Foundation Trust
What is a rigid cystoscopy? It is a visual examination of the inside of ... • Avoid heavy lifting or strenuous activity for one week. • Do not drive a ...
[47]
The community-based morbidity of flexible cystoscopy - PubMed
Although FC is well tolerated, gross haematuria, urinary frequency and dysuria occur afterward much more frequently than expected.Missing: side | Show results with:side
[48]
[PDF] CYSTOSCOPY and STENT PLACEMENT POSTOPERATIVE ...
CYSTOSCOPY and STENT PLACEMENT POSTOPERATIVE INSTRUCTIONS. 24 hours ... You may also be given a prescription for tamsulosin (Flomax), this helps relax the.
[49]
The risk of urinary tract infection after flexible cystoscopy in patients ...
A febrile urinary tract infection developed within 30 days of cystoscopy in 59 patients (1.9%), including in 3.7% of infected and 1.4% of uninfected patients (p ...
[50]
Effect of antibiotic prophylaxis after flexible cystoscopy to prevent ...
Oct 2, 2025 · Routine antibiotic prophylaxis after flexible cystoscopy may be omitted in lowrisk patients. These findings support current EAU/AUA guidelines, ...
[51]
Bleeding and thrombotic risk after direct oral anticoagulant ...
Jul 14, 2025 · Taylor et al. found a bleeding complication rate of 26.3% in anti-coagulated patients having TURP compared with 9.8% in the non-anticoagulated.
[52]
IUC24427-84 Reducing UTI and sepsis after flexible cystoscopy - NIH
Flexible cystoscopy is a common urological procedure, with a low risk of urinary tract infection and sepsis. This risk is greater in high-risk patients.
[53]
Anaphylaxis After Cystoscopy
Jul 3, 2014 · IgE-mediated reactions to local anesthetics are said to be very, very rare, and I have actually not ever seen one in 18 years of practice.Missing: complications | Show results with:complications
[54]
[PDF] cysview
Nov 22, 2016 · Eye irritation, Photophobia. Gastrointestinal disorders ... The following side effects may happen after blue-light cystoscopy with Cysview.
[55]
Cystoscopy - Veterian Key
Sep 10, 2016 · Transurethral cystoscopy with a rigid cystoscope is the preferred approach for female dogs and cats (Figures 17-1 through 17-6). The urethra and ...
[56]
Overview of small animal urinary tract endoscopy (Proceedings)
Cystoscopies are considered a sterile procedure at the VMTH. Our rigid endoscopes and light cables are packaged and steam sterilized according to manufacturer's ...
[57]
Cystoscopy: Techniques and clinical applications - ScienceDirect.com
This article reviews cystoscopy equipment, procedures, and common applications of cystoscopy. ... procedures of the lower urinary tract in dogs and cats.
[58]
Use of laser lithotripsy for fragmentation of uroliths in dogs: 73 cases ...
Jun 1, 2008 · Conclusions and Clinical Relevance—Transurethral cystoscope–guided laser lithotripsy was successful in female dogs and most male dogs for ...
[59]
Cystoscopy and Lithotripsy in Dogs and Cats - VetSpecialists.com
Jun 23, 2020 · Cystoscopy is endoscopy of the bladder and urethra performed with a thin lighted tube called a cystoscope. This procedure is performed in a ...
[60]
How to care for the cystoscopy patient
When in the bladder, the endoscopy assistant removes the urine with a 60ml syringe and 3-way tap, through the instrument channel (if using a flexible endoscope) ...
[61]
Cystoscopy in Dogs and Cats - ResearchGate
Aug 6, 2025 · Complications of cystoscopic interventions in dogs and cats can include trauma to the urethral bladder mucosa, transient urethritis, urethral ...