Figure 3a. Renal urine leak and urinoma in a 20-year-old man who sustained right renal trauma in a motor vehicle accident. (a) Contrast-enhanced CT scan shows a fracture of the right kidney and a surrounding perinephric urinoma. (b) Delayed phase CT scan obtained 1 week later shows a persistent large perinephric urinoma. Note the high-attenuation contrast material in the dependent portion of the collection (arrow), a finding that indicates active leakage of enhanced urine. The patient developed progressive abdominal pain with initial conservative treatment, and a percutaneous urinoma drainage catheter was placed under US guidance. (c) CT scan obtained after percutaneous drainage of the perinephric urinoma helps confirm optimal placement of the drainage catheter. (d) Sagittal US image obtained 4 weeks after urinoma drainage catheter placement demonstrates complete resolution of the perinephric urinoma and continued healing of the right renal fracture.