Primary intracranial adenoid cystic carcinoma (cylindroma)

A case of Gasserian ganglion region adenoid cystic carcinoma (cylindroma) is presented. Electron microscopic studies of a surgical biopsy specimen from this tumor revealed many morphologic features similar to those described in adenoid cystic carcinomas elsewhere in the body. An unusual feature of this tumor was the presence of glycogen in some of the tumor cells. Possible etiologic significances of the ultrastructural findings are discussed.