Mesonephric adenocarcinoma of the uterine cervix: a case report with immunohistochemical and ultrastructural studies.

A very rare case of mesonephric adenocarcinoma with lobular mesonephric hyperplasia in the uterine cervix of a 46-year-old female is presented. The lesion was a 4 cm, exophytic, almost circumferential, whitish yellow, friable mass in the uterine cervix. Microscopically, the tumor was composed predominantly of atypical round to polygonal cells arranged in a ductal, tubular, or papillary pattern. The tumor involved the entire cervix with varying depths of penetration. Lobular mesonephric hyperplasia was also observed in the lateral cervical wall and adjacent to the tumor. Immunohistochemically, the tumor was positive for CAM5.2, CK7, epithelial membrane antigen, calretinin, and chromogranin A, and was negative for vimentin, carcinoembryonic antigen, estrogen and progesterone receptors, and CD10. An ultrastructural analysis showed telolysomes, which were characteristic features of mesonephric epithelium. The patient was alive without disease at 4 months after surgery.