Figure 1c. Renal urine leak and urinoma in a 24-year-old man who sustained left renal trauma in a motor vehicle accident. (a) Contrast material-enhanced CT scan shows a fracture of the left kidney and a surrounding perinephric urinoma. Faint high attenuation is seen within the urinoma laterally (arrow), a finding that represents a leak of enhanced urine from the renal collecting system. (b) Delayed phase CT scan obtained slightly caudad to the left kidney 10 minutes later shows increased attenuation of the urinoma. Note the contrast material in the dependent portion of the urinoma collection (arrow). (c) Contrast-enhanced CT scan obtained after 3 months of conservative therapy demonstrates an interval decrease in the size of the urinoma, with a small amount of contrast material in the dependent portion of the urinoma (arrow). Note that the anterior renal fracture fragment (arrowheads) is surrounded by a smaller urinoma and is now closer to the remainder of the kidney.