Pseudomembranous colitis due to Clostridium difficile.

1. Department of Radiology, Bezmialem Vakif University, Faculty of Medicine, Istanbul, Turkey Background: A 25-year-old man was treated with ampicillin for acute tooth inflammation. After five days, he presented to the emergency department with intermittent abdominal pain especially at the right lower and left upper quadrant, bloody diarrhea, fever and nausea. Physical examination revealed diffuse abdominal tenderness, especially at right lower quadrant and right flank, but no peritoneal signs. Laboratory studies showed an elevated white blood cell count and metabolic acidosis. Plain radiography of the abdomen was obtained, followed by emergency abdominal contrastenhanced CT for further evaluation.