An Unexpected Case of Perforated Acalculous Cholecystitis Caused by a Fish Bone.

Gallbladder inflammation is most often determined by the presence of gallstones. Acalculous cholecystitis usually occurs in patients with multiple comorbidities or with an immunosuppressed status, and therefore its evolution is faster and more severe compared to acute calculous cholecystitis. The presence of a fish bone into the peritoneal cavity, through a gastrointestinal fistula is not very rare, but acute cholecystitis caused by a fish bone is unexpected.