Choroid Plexus Papilloma

Choroid plexus tumors comprise less than 1% of all brain tumors. Almost 80% of cases occur in children making up 2% to 4% of pediatric brain tumors. The most common location is lateral ventricles. Given their location, the presenting symptoms and signs are related to hydrocephalus and increased intracranial pressure. Choroid plexus papillomas are circumscribed, papillary masses consisting of pseudostratified epithelial cells lining fibrovascular cores as seen in this low power image. They closely resemble normal choroid plexus, however, they are more cellular and exuberant and lack the surface hobnailing of the normal choroid plexus. The cytologic atypia is minimal or absent and mitotic activity is not increased.