A choroid plexus papilloma in an elasmobranch (Squalus acanthias)

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.