A 64-year-old man is admitted to the hospital for the assessment of hematuria after being involved in a motor vehicle accident. His physical examination is normal. A CT scan of the abdomen is shown in Figure below. Which of the following is the most likely diagnosis?

**Core Concept**
The question is testing the student's ability to diagnose a urinary tract injury based on imaging findings. The underlying principle is the recognition of characteristic radiographic signs of urinary tract trauma, specifically the presence of a ureteropelvic junction (UPJ) injury.

**Why the Correct Answer is Right**
The CT scan likely shows a UPJ junction injury, which is a common type of urinary tract injury in the setting of abdominal trauma. The UPJ is the point where the renal pelvis meets the ureter. In a UPJ injury, there may be a disruption of the blood supply to the ureter, leading to ischemia and potentially severe bleeding. The correct diagnosis would be a UPJ junction injury, which would require prompt surgical intervention to prevent further complications.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is likely a distractor, as it does not accurately describe a common urinary tract injury in the setting of abdominal trauma.
* **Option B:** This option is incorrect because a renal laceration would typically present with more severe hematuria and possibly a palpable mass on physical examination, not just hematuria.
* **Option C:** This option is incorrect because a bladder rupture would typically present with more severe symptoms, including pelvic pain, difficulty voiding, and possibly a palpable mass on physical examination.

**Clinical Pearl / High-Yield Fact**
A UPJ junction injury is a common type of urinary tract injury in the setting of abdominal trauma, and prompt recognition and treatment are crucial to prevent further complications.

**Correct Answer:** C.

✓ Correct Answer: A. renal cell carcinoma