Choroid plexus papilloma

Choroid plexus tumors (CPTs) are rare intraventricular papillary neoplasms of neuroectodermal origin, accounting for less than 1% of all intracranial tumors and 2-4% of pediatric brain tumors. CPTs are categorized by three distinct histologies; choroid plexus papilloma, atypical choroid plexus papilloma, and the malignant choroid plexus carcinoma. Choroid plexus papillomas outnumber choroid plexus carcinomas and are composed of a single layer of cuboidal-to-columnar cells, resting on a basement membrane overlying papillary and vascularized connective tissue.