Colloid cyst causing rhinorrhea.

A case of nontraumatic cerebrospinal fluid (CSF) rhinorrhea secondary to obstruction of the flow of cerebrospinal fluid by a colloid cyst is reported. Only 1 other case of CSF rhinorrhea secondary to a colloid cyst has been reported. A review of the world literature reveals 33 cases of CSF rhinorrhea secondary to obstruction of flow of cerebrospinal fluid.