Fig. 5
From: MDCT of blunt renal trauma: imaging findings and therapeutic implications
a–b Parenchymal laceration involving the collecting system (AAST grade IV). On these 3-mm-thick multiplanar reconstruction (MPR) axial images acquired during the nephrographic (a) and 8-min delayed phase (b) of the study in the same patient, multiple irregular clefts of absent contrast enhancement (arrows), starting from the renal surface and extending deep into the renal parenchyma, are clearly appreciable, representing parenchymal lacerations. On delayed image (b), hyperdense urine leakage (arrowhead) is recognisable as a sign of collecting system rupture