Figure 8. A 93-year-old woman 10 days after surgery for perforated duodenal ulcer presented with fever and pus discharge through operative sutures. Contrast enhanced CT shows gas bubbles and extravasation of the orally ingested contrast medium (black arrow) reaching the skin (white arrow), compatible with leak and cutaneous fistula. Reactive "sandwich-like" thickening of the gallbladder wall is seen.