Fig. 1
From: MDCT of blunt renal trauma: imaging findings and therapeutic implications
a–d Renal contusion (AAST grade I) (a and b) and renal infarction (AAST grade IV) (c and d). Axial multiplanar reconstruction (MPR) images (1.5 mm thick a and b; 3 mm thick c and d) acquired during the nephrographic phase (a and c) and the 8-min delayed phase (b and d) of the study in two different patients. Renal contusion appears as an ill-defined, irregularly shaped area of reduced contrast enhancement during the nephrographic phase (a, arrowhead) and tends to isodensity in the delayed phase (b, arrowhead), whereas segmental infarction appears as a wedge-shaped, sharply defined area of reduced/absent contrast enhancement during the nephrographic phase (c, arrow) and shows marked hypodensity also in the delayed phase (d, arrow)