Perforation of the digestive tract through foreign bodies is extremely rare in patients without pre-existing intestinal disease. We report the case of a 70-year-old patient who came at the emergency room with high fever, chills, lower abdominal pain, accelerated intestinal transit and without a personal history of intestinal disease or abdominal surgery. Laboratory data showed leukocytosis with neutrophilia. Computerized tomography highlights a mixed, hydroaeric pelvic collection and the presence in the vicinity of a hyperdense filiform tract of uncertain cause. Laparoscopic surgery was performed and a pelvic abscess, respectively a sigmoid micro-perforation was observed by the presence of a fish bone. Foreign body extraction, lavage and drainage of the peritoneal cavity were practiced with favourable later evolution.