RT Journal Article SR Electronic T1 Sigmoid colon endometriotic mass JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 630 OP 633 DO 10.15537/smj.2015.5.11268 VO 36 IS 5 A1 Hamad H. Al-Qahtani A1 Haitham Alfalah A1 Reem A. Al-Salamah A1 Adel A. Elshair YR 2015 UL http://smj.org.sa/content/36/5/630.abstract AB Large bowel obstruction is a rare complication of gastrointestinal endometriosis. A 32-year-old female patient presented to the emergency department with complaints of diffuse abdominal pain and constipation for 10 days with progressive abdominal distention and vomiting. Plain abdominal x-ray showed grossly dilated large bowel up to the sigmoid colon with no gas in the rectum. Abdominal computed tomography revealed hugely dilated large bowel up to the sigmoid colon, with sigmoid soft tissue mass. Flexible sigmoidoscopy showed a non-ulcerating sigmoid mass, with complete obstruction of the sigmoid colon, which impeded the further advancement of the scope. She underwent exploratory laparotomy with provisional diagnosis of complete large bowel obstruction due to sigmoid tumor. Sigmiodectomy with end colostomy was performed. Histopathology revealed endometrial glands with stroma in muscularis properia of the sigmoid colon mass. Endometriosis should be considered in women of reproductive age presenting with symptoms of large bowel obstruction.