A 63-year-old man with diabetes presented with a twoday history of fever and left flank pain. A physical examination revealed hypotension, tachycardia and left lower abdominal tenderness. Laboratory tests showed leukocytosis with bandemia and metabolic acidosis. A plain abdominal film showed an outpouching left psoas shadow (Picture 1, arrows). Contrast-enhanced abdominal computed tomography re...
