摘要A surgical drainage simple surgical procedure that enables elimination of pathological effluent from operative wounds or other anatomical spaces, as well as removal of possible pathological exudates (blood, pus, enteric content, pancreatic juice, etc.). Nowadays, silicone drains are used for draining of the peritoneal cavity. In this study we presented a case of 42-year old female patient who underwent surgery after traumatic injury of intraabdominal organs and fracture of pelvic ring bone structure. Postoperative drain placed into the rectovesical space could not be removed on day 17 post surgery. Additional diagnostics could not identify the actual reason of failing to remove the drain, thus relaparotomy was required. Intraoperative diagnosis revealed incarceration of the antimesenteric part of the appendix into two circumjacent side perforations in the drain, without signs of acute inflammation. This paper presents an unusual and rare case of peritoneal drainage complication. The drainage of peritoneal cavity should be performed only in appropriate clinical situations, i.e. when the procedure is surgically indicated.