Mixed adenocarcinoma and neuroendocrine carcinoma arising in the urachus. A case report and review of the literature.

Primary urachal carcinomas are very rare urological malignancies. In the present article we report an unusual case of a small cell carcinoma with neurendocrine features and adenocarcinoma arising in the urachus, and review the literature. The results of the immunohistochemical studies are presented.