11 (a) Pyelonephritis. This patient presented with acute flank pain. Note the striated nephrogram within the slightly enlarged kidneys, typical of acute pyelonephritis. (b) Pancreatitis. In another patient receiving protease inhibitor, there is enlargement and heterogeneity of the head of the pancreas associated with stranding of the peripancreatic fat. The appearance is consistent with acute pancreatitis.

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