MRI evaluation of acute renal trauma

We describe the MR findings in a patient with acute renal injury after blun t abdominal trauma associated with perinephric hematoma and urinoma, Both C T and MR findings are described. Active urine extravasation into a perineph ric urinoma is demonstrated by serial post-contrast imaging with CT and MRI showing progressively increased attenuation/signal intensity fluid in comm unication with the collecting system, commencing 2 minutes after contrast a dministration.