The term gossypiboma is used to describe surgical sponges that are retained after surgery and are a rare but serious complication due to its medicolegal consequences.The possibility of gossypiboma should be kept in mind in the differential diagnosis of patients with a history of surgery and presenting with non-specific symptoms.Our case is a 59-years-old male patient who had a history of gastric perforation surgery in another center 20 years ago.There were complaints of swelling and tenderness in the left upper quadrant and non-specific abdominal pain.Laboratory examination revealed specific tumor marker elevation, radiological examinations revealed gossypiboma and incidental abdominal masses.The masses were removed laparoscopically and pathologically reported as gossypiboma and gastrointestinal neuroendocrine tumors.For this purpose, the materials used during the surgery should be carefully counted, postoperative wound and cavity research should be done before the wound is closed, radiologically detectable materials should be used.