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251902 Atypical papilloma of choroid plexus

definition

Atypical papilloma of the choroid plexus is a very rare type of choroid plexus tumor (see this term) that, contrary to papilloma of the choroid plexus (see this term), has an increased likelihood of progression to carcinoma and of recurrence. It displays brisk mitoses, nuclear pleomorphism, raised cellular density, obscurity of the papillary growth pattern, and cell necrosis.