Fig. 6.

Mimicking a postoperative collection, a fluid-containing structure (arrowheads) with thin walls is seen 2 months after surgery in the operated gallbladder fossa at both ultrasound (a) as well as precontrast (b) and enhanced (c) CT, which corresponded to the gallbladder remnant after subtotal open cholecystectomy for acute cholecystitis and cholecysto-duodenal fistula