Gastrointestinal duplication is a rare congenital anomaly which can occur anywhere along the digestive tract. The most common site is the mesenteric border of the terminal ileum. Intestinal duplication usually becomes symptomatic early in life with the severity of symptoms depending on the location and type of mucosal lining. Ectopic gastric mucosa is an associated possibility. Gastrointestinal hemorrhage is the most serious complication, which can cause severe anemia and shock. Another complication, although rare, is carcinoma in a duplicate cyst. We experienced an unusual case of a 12-years-old girl who presented with intermittent abdominal pain and hematochezia. There was no abnormality on Meckel's scan. Abdominal CT revealed a cystic mass in the pelvic cavity and subsequent transabdominal ultrasound showed the double-layered wall of the duplication. We performed laparoscopy-assisted, segmental resection of the ileum. The patient was discharged without any complication on the 7th postoperative day.