Abstract
A 42-year-old woman was seen at our hospital because of abdominal pain in September 2007 (the 2nd day of menstrual period) and was admitted with a diagnosis of small bowel obstruction after CT scanning. The CT also showed a tumor lesion in the abdominal cavity. The bowel obstruction was conservatively treated. Follow up CT scan at seventh day ravealed disappearance of dilatation of the small intestine as well as the tumor like lesion. In January 2008 (the 2nd day of the period), she was readmitted to the hospital because of ileus. Ectopic endometriosis was suspected based on the tumor like lesion on CT and recurrent ileus at menstrual periods. Ectopic endometriosis was also suspected by MRI. On March 2008 (the 3rd day of the period), she was readmitted because of ileus. An emergency operation was performed for this recurrent ileus. Laparotomy disclosed inflammatory adhesion at the terminal ileum and it was considered the obstructive part. Partial resection of the small intestine was performed. Moreover, some white nodes 5mm in diameter were scattered on the surface of the proximal intestine. The histopathological diagnosis was endometriosis. We conclude that clinical findings and diagnostic imagings are useful for making the diagnosis of ectopic endometriosis.