[A tumor of the uterus with a falsely benign aspect]

We report the case of a 79 year-old woman, who was admitted in the department of digestive surgery for an occlusive syndrome. The abdominopelvic computed tomography revealed a voluminous mass infiltrating the uterus, the bladder and the colon. A monobloc surgery is performed. The histopathological examination evidences an invasion of these organs by a well-differentiated glandular proliferation composed of epithelial cells without atypia stained with keratin 7 and carcinoembryonar antigen, without expression of p16, hormonal receptors and keratin 20. Ki-67 labeling index was low. The diagnosis of minimal deviation gastric mucinous adenocarcinoma was proposed. This is an uncommon neoplasm comprising approximately 1% of all endocervical adenocarcinomas. This is a difficult histopathological which should be known by pathologist. It is correlated to a poor clinical outcome with a high tendency to lymph node and extra-uterine metastases, as illustrated in our observation.