<prompt> 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?renal cell carcinomakidney contusion and lacerationtransitional cell carcinomarenal hamartoma  <response>: The diagnosis is renal cell carcinoma. There is marked hypervascularity of the left kidney. The arteries are irregular and tortuous, following a random distribution. The kidney is enlarged and abnormally bulbous in the lower pole. CT scans have dramatically decreased the need for arteriography in evaluating renal lesions. 