Fig. 4
Common appearance of non-infected postoperative collections in the gallbladder fossa. a Forty-eight hours after laparo-endoscopic rendezvous cholecystectomy, the surgical bed is occupied by a mixed collection (arrowhead) containing non-dependent air and dense fluid, lacking a perceptible wall. b, c Six days after open cholecystectomy converted from laparoscopic cholecystectomy, a sizeable, inhomogeneous fluid collection (arrowheads) with a few gas bubbles is present. Both collections resolved without any directed treatment