Urethrogram Antegrade + Retrograde (With Contrast) at Dr. Essa Lab

Urethrogram Antegrade + Retrograde (With Contrast) at Dr. Essa Lab

The Urethrogram Antegrade + Retrograde (With Contrast) at Dr. Essa Lab is a highly specialized, dual-phase fluoroscopic imaging examination designed to evaluate the entire length of the male and female urethra. This diagnostic procedure is critical for assessing structural abnormalities, obstructions, and traumatic injuries within the lower urinary tract. By combining both retrograde (against the normal flow of urine) and antegrade (with the normal flow of urine) imaging techniques, radiologists can obtain a comprehensive, dynamic, and highly detailed map of the urethral lumen, the bladder neck, and the external urethral sphincter. Dr. Essa Laboratory & Diagnostic Centre, a trusted pioneer in diagnostic services in Karachi, Pakistan, utilizes advanced digital fluoroscopy systems to perform this procedure with high precision, minimal radiation exposure, and maximum patient comfort.

During the retrograde phase of the examination, a water-soluble, iodinated contrast medium is gently introduced into the urethra through the external meatus. This phase is exceptionally effective at delineating the anatomy of the anterior urethra, which includes the penile (pendulous) and bulbar segments. It allows for the precise localization of strictures, diverticula, and mucosal irregularities. The antegrade phase, often performed in conjunction with a voiding cystourethrogram (VCUG) or via an existing suprapubic catheter, visualizes the posterior urethra, which comprises the membranous and prostatic segments. As the patient voids the contrast medium, the radiologist captures real-time fluoroscopic images that demonstrate the functional opening of the bladder neck and the caliber of the posterior urethra under physiological pressure. Combining these two phases is the gold standard for evaluating complex urethral strictures, particularly when planning reconstructive urological surgeries such as urethroplasty.

The clinical importance of this combined study lies in its ability to provide both anatomical and functional information that standard endoscopic examinations, like cystoscopy, cannot fully capture. While cystoscopy allows direct visualization of the urethral mucosa, it cannot measure the exact length of a complete urethral stricture or evaluate the patency of the urethra proximal to a tight obstruction. The Urethrogram Antegrade + Retrograde (With Contrast) bridges this diagnostic gap, offering urologists a precise roadmap of the diseased segment, including its length, location, and the health of the surrounding urethral tissue. This detailed diagnostic value is essential for selecting the appropriate surgical approach, monitoring post-operative healing, and diagnosing complex congenital or acquired lower urinary tract disorders.

Clinical Procedure: What to Expect

Patient Preparation

• Informed Consent: The patient must sign a consent form after a detailed explanation of the procedure, its benefits, and potential risks, such as transient discomfort or contrast sensitivity.
• Antibiotic Prophylaxis: Patients may be advised by their referring urologist to start a short course of oral antibiotics prior to the procedure to minimize the risk of introducing a urinary tract infection (UTI).
• Active Infection Screening: The procedure should not be performed in patients with an active, untreated urinary tract infection. A recent clean-catch urine culture showing no growth is highly recommended.
• Hygiene: The perineal and genital areas must be thoroughly washed with soap and water on the morning of the examination.
• Fasting Requirements: Routine fasting is generally not required for a urethrogram; however, patients are advised to consume a light meal and remain well-hydrated before the test.
• Allergy Notification: Patients must inform the clinical staff if they have a history of allergies to iodinated contrast media, asthma, or severe renal impairment.
• Clothing: Patients will be asked to change into a clean hospital gown and remove all clothing, jewelry, and metal objects from the pelvic region to prevent imaging artifacts.

During the Procedure

The patient is positioned on the fluoroscopy table, initially lying flat on their back (supine position). The external genitalia are cleansed using a sterile antiseptic solution, and sterile drapes are placed around the pelvic area. For the retrograde urethrogram (RUG), a small, sterile catheter (often a pediatric Foley catheter) is inserted just into the tip of the urethra (the meatus). The catheter balloon is inflated very minimally with sterile water (usually 1 to 2 mL) in the fossa navicularis to hold the catheter in place, or the catheter is held manually with gentle traction to maintain a seal. Under real-time fluoroscopic guidance, a sterile, water-soluble contrast agent is slowly injected. The radiologist takes spot films in oblique positions to fully project the anterior urethra without bony overlap from the pelvis.

For the antegrade phase, if the patient has an existing suprapubic catheter, contrast is instilled directly into the bladder through this tube until the patient feels a strong urge to urinate. If no suprapubic tube is present, the bladder is filled with contrast retrograde. Once the bladder is fully distended, the patient is asked to void into a radiolucent urinal while standing or in a semi-recumbent oblique position. Fluoroscopic images are captured dynamically during micturition. This allows the radiologist to observe the bladder neck opening and the contrast flowing through the posterior urethra. The entire procedure typically takes between 30 to 45 minutes. Patients may experience a mild sensation of fullness, warmth from the contrast, or a transient urge to urinate, but severe pain is uncommon. Radiation safety protocols, including appropriate collimation and lead shielding of non-target areas, are strictly maintained throughout the study.

When is a Urethrogram Antegrade + Retrograde (With Contrast) Performed?

Evaluation of Urethral Stricture Disease

Urethral stricture disease, characterized by the narrowing of the urethral lumen due to scarring, is one of the primary indications for this combined study. Chronic inflammation, previous catheterization, or urethral instrumentation can lead to fibrotic changes in the corpus spongiosum. When a patient presents with obstructive voiding symptoms, a retrograde urethrogram is paired with an antegrade study to determine the exact proximal and distal limits of the stricture. This dual approach is vital for surgical planning, as it tells the reconstructive urologist whether the stricture is short enough for primary excision and anastomosis or if a buccal mucosa graft urethroplasty is required.

Assessment of Pelvic Trauma and Urethral Rupture

Pelvic fractures resulting from high-energy trauma, such as motor vehicle accidents or falls, are frequently associated with posterior urethral distraction defects. In these emergency or subacute scenarios, a retrograde urethrogram is performed to evaluate for urethral transection or extravasation of contrast. If a suprapubic catheter was placed during acute resuscitation, an antegrade study is performed simultaneously to assess the gap between the severed ends of the urethra. This helps the surgical team plan the delayed perineal reconstruction of the posterior urethra.

Investigation of Post-Operative Complications

Following urological procedures such as transurethral resection of the prostate (TURP), hypospadias repair, or urethroplasty, patients may develop complications like recurrent strictures, anastomotic leaks, or false passages. The Urethrogram Antegrade + Retrograde (With Contrast) is performed to assess the integrity of the surgical repair. The contrast outlines the surgical site, demonstrating whether the urethral lumen has healed with an adequate caliber and confirming the absence of contrast extravasation, which would indicate an active leak or a patent fistula.

Detection of Congenital Lower Urinary Tract Anomalies

In pediatric or young adult patients presenting with lifelong voiding dysfunction, recurrent urinary tract infections, or bilateral hydronephrosis, congenital anomalies must be ruled out. Conditions such as posterior urethral valves (PUV), congenital urethral diverticula, or syringoceles of the Cowper’s gland duct can cause severe bladder outlet obstruction. The antegrade phase of this study is particularly sensitive in demonstrating the classic ballooning of the posterior urethra and the thin, obstructing membranes characteristic of posterior urethral valves during voiding.

Diagnosis of Urethral Fistulas and Diverticula

Urethral fistulas (such as urethrocutaneous, urethrorectal, or urethrovaginal fistulas) and urethral diverticula can cause persistent perineal drainage, recurrent infections, and post-void dribbling. These conditions can arise from trauma, infection, or prior surgeries. During the contrast injection, the fluoroscopic study captures the abnormal passage of contrast medium from the urethral lumen into adjacent structures (like the rectum, vagina, or perineal skin) or into a localized outpouching (diverticulum), providing definitive diagnostic evidence and anatomical localization for surgical correction.

What Does a Urethrogram Antegrade + Retrograde (With Contrast) Detect?

• Focal Urethral Stricture: A localized area of narrowing within the anterior or posterior urethra, showing restricted contrast flow.
• Long-Segment Urethral Stenosis: Extensive scarring involving a significant portion of the penile or bulbar urethra.
• Complete Urethral Obliteration: Total blockage where contrast cannot pass beyond the point of obstruction from either the retrograde or antegrade approach.
• Urethral Distraction Defect: A separation between the proximal and distal ends of the urethra, typically seen after severe pelvic fractures.
• Contrast Extravasation: Leakage of contrast medium outside the urethral lumen, indicating a tear, rupture, or active anastomotic leak.
• Urethrocutaneous Fistula: An abnormal tract connecting the urethra to the skin of the penis, scrotum, or perineum.
• Urethrorectal Fistula: A communication between the urethra and the rectum, allowing contrast to enter the bowel lumen.
• Urethrovaginal Fistula: An abnormal connection between the female urethra and the vagina.
• Urethral Diverticulum: An outpouching of the urethral wall that fills with contrast during the study.
• Posterior Urethral Valves: Congenital mucosal folds in the prostatic urethra causing proximal dilation and bladder outlet obstruction during the voiding phase.
• Bladder Neck Contracture: Narrowing of the outlet of the urinary bladder, often seen as a complication of prostate surgery.
• False Passage: An artificial channel created parallel to the true urethra, usually due to traumatic catheterization or instrumentation.
• Cowper’s Gland Duct Syringocele: Cystic dilation of the Cowper’s gland duct projecting into the bulbar urethra.
• Urethral Calculi: Radiolucent or radiopaque stones lodged within the urethral lumen, causing filling defects.
• Urethral Polyps: Benign mucosal growths presenting as smooth, persistent filling defects within the contrast column.
• Prostatic Fossa Dilation: Widening of the prostatic urethra, commonly observed after a transurethral resection of the prostate (TURP).
• External Sphincter Spasm: Failure of the external urethral sphincter to relax normally during the voiding phase of the study.
• Urethral Trauma (Partial Tear): Incomplete disruption of the urethral wall characterized by localized contrast extravasation with some contrast still entering the bladder.
• Urethral Trauma (Complete Transection): Total disruption of the urethra where contrast spills entirely into the pelvic or perineal tissues, failing to reach the bladder.
• Meatal Stenosis: Narrowing at the very tip of the urethra (meatus), restricting the insertion of the catheter or the outflow of contrast.
• Post-Traumatic Synechiae: Fine fibrous bands crossing the urethral lumen, visible as thin filling defects.
• Trabeculated Bladder: Thickening and irregularity of the bladder wall, visible during the antegrade phase, indicating chronic bladder outlet obstruction.
• Bladder Diverticulum: Outpouchings of the bladder mucosa through the detrusor muscle, filled with contrast during the cystourethrogram phase.
• Vesicoureteral Reflux (VUR): Abnormal retrograde flow of contrast from the bladder up into the ureters and kidneys during voiding.

Turnaround Time and Report Access at Dr. Essa Lab

At Dr. Essa Laboratory & Diagnostic Centre, we understand that timely diagnostic reports are crucial for prompt clinical decision-making, especially when surgical interventions are being planned. The fluoroscopic images captured during your Urethrogram Antegrade + Retrograde (With Contrast) are immediately processed using our advanced digital imaging systems. A consultant radiologist specializing in genitourinary imaging carefully reviews the dynamic fluoroscopic runs, spot films, and post-void images to formulate a comprehensive diagnostic report.

The finalized, signed report along with high-resolution printed films or digital copies is typically available within 24 to 48 hours after the completion of the procedure. For added convenience, Dr. Essa Lab offers secure online report access through our official website and mobile application. Patients and their referring physicians can easily view, download, and share the diagnostic reports and digital images from the comfort of their homes or clinics, ensuring seamless continuity of care.

Urethrogram Findings Overview

Structure / Parameter Evaluated	Normal Findings	Possible Abnormal Findings
Anterior Urethra (Penile & Bulbar)	Smooth, uniform caliber without narrowing or filling defects.	Strictures, diverticula, mucosal irregularities, or false passages.
Posterior Urethra (Membranous & Prostatic)	Normal widening during voiding; smooth transition through the prostate.	Posterior urethral valves, strictures, or dilation post-prostatectomy.
Bladder Neck	Funneling and complete opening during the voiding (antegrade) phase.	Bladder neck contracture, rigid narrowing, or failure to open.
Contrast Flow	Continuous, unobstructed flow from the meatus to the bladder and vice versa.	Interrupted flow, complete obstruction, or deviation of the stream.
Urethral Wall Integrity	No contrast extravasation; contrast remains entirely within the lumen.	Contrast extravasation indicating tears, ruptures, or fistulous tracts.
External Sphincter Zone	Appropriate relaxation during micturition.	Persistent narrowing or spasm causing functional obstruction.
Post-Void Residual	Minimal or no contrast remaining in the bladder or urethra after voiding.	Significant contrast retention in the bladder or within a diverticulum.

Note: Diagnostic findings should always be interpreted by a qualified healthcare professional together with the patient’s symptoms, medical history, physical examination, laboratory investigations, previous imaging studies, and other relevant clinical information. Additional investigations or specialist consultation may be recommended depending on the findings.

Why Choose Dr. Essa Lab for Urethrogram Antegrade + Retrograde (With Contrast)?

• Experienced Healthcare Professionals: Our team consists of highly qualified consultant radiologists and skilled technologists specializing in fluoroscopic and genitourinary imaging.
• Patient-Focused Care: We prioritize patient comfort and dignity, ensuring a compassionate, respectful, and private environment during this sensitive procedure.
• Quality Diagnostic Services: Dr. Essa Lab is committed to maintaining the highest standards of diagnostic accuracy, utilizing rigorous quality control protocols.
• Professional Reporting: Detailed, precise, and structured diagnostic reports are authored by expert radiologists to assist your urologist in treatment planning.
• Modern Diagnostic Approach: We utilize advanced digital fluoroscopy equipment that delivers high-resolution real-time imaging with optimized, lower radiation doses.
• Comfortable Environment: Our dedicated fluoroscopy suites are designed to provide a clean, sterile, and comfortable experience for all patients.
• Convenient Location: With an extensive network of branches across Karachi, Pakistan, accessing premier diagnostic services is highly convenient.
• Commitment to Accurate Diagnosis: For over five decades, Dr. Essa Lab has been a trusted household name in Pakistan, dedicated to clinical excellence and reliable diagnostic outcomes.