Psammomatous choroid plexus papilloma: Three cases with atypical characteristcs

BackgroundIntravertricular papillary neoplasms are derived from choroid plexus epithelium. Although choroid plexus tumors account for 0.4% to 0.6% of all brain tumors, they represent 2% to 4%. Approximately 80% of choroid plexus carcinomas arise in children.Cases DescriptionWe describe 3 cases of choroid plexus papilloma (CPP) with profuse psammomatous bodies and calcifications that have lost their normal papillary architecture. Immunohistochemistry was positive for glial fibrillary acidic protein in 2 cases, and proliferating cellular nuclear antigen index was higher compared with regular CPPs. All 3 patients were female and were 12, 40, and 48 years old, respectively.ConclusionWe describe psammomatous CPPs and suggest a difference from CPPs because of the more aggressive clinical course, and higher nuclear proliferation index (proliferating cellular nuclear antigen) than the CPPs that lack psammoma bodies.