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Updated: Feb 6, 2026

Author Spotlight: Insights and Innovations in Gene Expression Manipulation Techniques for Choroid Plexus Research
Published on: June 16, 2023
Rapid malignant progression of an intraparenchymal choroid plexus papillomas
Luca Ruggeri1, Nicola Alberio1, Raffaele Alessandrello1
1Unit of Neurosurgery, S. Elia Hospital, Caltanissetta, Italy.
Background:
Choroid plexus tumors (CPTs) are rare neoplasms accounting for only 0.3-0.6% of all brain tumors in adults and 2-5% in children. The World Health Organization (WHO) classification describes three histological grades: grade I is choroid plexus papilloma (CPP), grade II is atypical papilloma, and grade III is the malignant form of carcinoma. In adults, CPTs rarely have a supratentorial localization.
Case Description:
Here we report a very rare case of an intraparenchymal parietal CPP with a rapid histological transition from grade I to grade III WHO in a 67-year-old man, in <7 months.
Conclusion:
Because of the rarity of these oncotypes, descriptions of each new case are useful, mostly to consider this diagnostic entity in extraventricular brain tumors of adults, despite an unusual location.
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