Carcinoma of the ureter with extensive squamous differentiation and positive immunoperoxidase staining for carcinoembryonic antigen: a case report.

A case of ureteral carcinoma with extensive squamous differentiation and positive staining for carcinoembryonic antigen by the immunoperoxidase method is presented. Ureteral carcinoma should be added to the list of tumors that may produce carcinoembryonic antigen or antigen-like material.