What is the diagnostic procedure of choice for bladder injury?

• A. Cystoscopy
• B. Retrograde cystourethrogram
• C. CT scan of the abdomen
• D. Urinary ultrasound

Answer: (B)

The diagnostic procedure of choice for detecting bladder injury is a retrograde cystourethrogram (RUG). This is a specialized imaging technique where contrast material is injected into the bladder through the urethra while taking X-rays to visualize the urinary tract. It is particularly valuable because it can identify not only bladder injuries but also those involving the urethra. This method allows for a detailed assessment of both the bladder and the urethra in cases of trauma, making it essential in the evaluation process.

In situations of suspected bladder injury, retrograde cystourethrogram is preferred as it provides real-time imaging and direct visualization of contrast flow, highlighting any potential leaks or trauma. Other modalities, such as CT scans, while useful for assessing abdominal injuries more broadly, may not provide the same level of detail specifically for bladder or urethral injuries. Cystoscopy is less commonly chosen as a first-line diagnostic tool because it is more invasive and typically used for therapeutic interventions rather than as an initial diagnostic step for trauma. Urinary ultrasound, while helpful in some scenarios, does not always adequately visualize the bladder or detect subtle injuries compared to the detailed imaging provided by retrograde cystourethrogram.