Abstract
Atypical choroid plexus papillomas (CPPs) are a rare variant of choroid plexus papillomas, extra-axial tumours that arise from the neuroepithelial lining of the choroid plexus. The latest WHO Classification defines as atypical CPPs as those choroid plexus papillomas that have increased mitotic activity, that is, at least 1 mitosis per mm2. Other features may include hypercellularity, cytological atypia, and necrosis. Atypical CPPs typically occur in the paediatric population.
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