Grade III renal laceration

(A) Axial parenchymal phase CT image demonstrates a laceration more than 1 cm deep (arrow) with adjacent fluid collection (arrowhead). At this time, urinary extravasation cannot be excluded, and the injury cannot be graded appropriately.
(B) Axial delayed phase CT image demonstrates the laceration (arrow) and adjacent fluid collection (arrowhead). Contrast is present in the collecting systems bilaterally, without evidence of contrast-enhanced urinary extravasation into the laceration or adjacent fluid collection, confirming that the fluid represents a hematoma. With this additional knowledge, the injury can now be designated a grade III laceration.