title: A choroid plexus papilloma in an elasmobranch (Squalus acanthias).
abstract: A choroid papilloma in the choroid plexus of the ala of the fourth ventricle in a mature male elasmobranch, Squalus acanthias, was described. This is apparently the first report of a neoplasm of the central nervous system in a member of the class Chondrichthyes.
mesh_terms: D000818:Animals; D002551:Cerebral Ventricle Neoplasms / Q000473:pathology / Q000662:veterinary*; D002831:Choroid Plexus; D004284:Dogfish; D004806:Ependymoma / Q000473:pathology / Q000662:veterinary*; D005393:Fish Diseases / Q000473:pathology*; D008297:Male; D012754:Sharks