Abstract
A 46-year-old woman was admitted because of abdominal pain. She was given a diagnosis of a ruptured right ovarian tumor. Abdominal computed tomography and magnetic resonance imaging showed an 8-cm cystic tumor in the right ovary, which was strongly suspected of malignancy. Endoscopic and radiological examinations revealed protruded lesion of the sigmoid colon. Invasion of the right ovarian cancer was considered, and surgery was performed. Intraoperative findings of a right ovarian tumor and a sigmoid colon tumor were separately demonstrated, necessitating total hysterectomy and bilateral salpingo-oophorectomy and sigmoidectomy, respectively. Histological examination revealed adenocarcinoma cells which were positive for ER and PgR in the specimen of the sigmoid colon. Endometrial glands were seen in proximity to the adenocarcinoma cells. The histological diagnosis was endometrioid adenocarcinoma, which was called generically endometriosis-associated intestinal tumor (EAIT). Moreover, the right ovarian tumor was histologically diagnosed as endometrioid adenocarcinoma. These were considered not metastases but double cancer because each tumor had endometrial glands. We report a very rare case of EAIT, which developed with ovarian endometrioid carcinoma.
