Abstract
A 44-year-old woman was admitted at a certain hospital because of lower abdominal pain, diarrhea and loss of weight in July 2003. Colonoscopy showed a submucosal tumor-like lesion located at the cecum. In October, she was referred to our hospital. We performed colonoscopy, abdominal computed tomography and FDG-PET, but correct diagnosis was not obtained. Because it was thought that the tumor was not malignant, she was observed with conservative treatment. She was admitted in February 2004, under the diagnosis of intestinal obstruction. In April, ileocecal resection was done. Histologically, the resected specimen was diagnosed as an intestinal endometriosis.