BACKGROUND Insertion of rectal foreign bodies intentionally or unintentionally is not unusual. METHODS A 19-years-old unmarried male was admitted to our hospital due to a lump of left lower quadrant of abdomen. He denied sexual assault .The abdomen was soft on physical examination. Abdominal x-ray and CT scan showed a foreign body in lower abdomen and pelvis. The patient was operated and a slice of glass was extracted. CONCLUSIONS In patients with rectal foreign body, the history is not always reliable and sexual assault may deny. The foreign object inserted in the rectum may migrate to peritoneal cavity without peritonitis.