Retained gallstone mimicking an abdominal wall metastasis in a patient with lung cancer 7 years after laparoscopic cholecystectomy

Retained gallstones, also called dropped or slipped gall-stones, are reported with an incidence of about 0.1—20% andrelated to gallbladder perforation or losing during specimenextraction [1].Retained gallstones can appear as peritoneal loose bod-ies, abdominal abscess, dropped appendicolith or peritonealmetastasis. Many cases of dropped gallstones are usuallyasymptomatic. The most common complication is infec-tion. The abscess location includes the intraperitoneal andextraperitoneal spaces [2].