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WHO Classification of Tumours
Atypical choroid plexus papilloma
Tumours of the central nervous system


The atypical choroid plexus papilloma (WHO grade II) occupies an intermediate position between the benign choroid plexus papilloma (WHO Grade I) that can be cured surgically and the malignant choroid plexus carcinoma (WHO Grade III). Histologically, it separates from the choroid plexus papilloma by an increased mitotic activity
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Jeibmann A, Hasselblatt M, Gerss J, Wrede B, Egensperger R, Beschorner R, Hans VH, Rickert CH, Wolff JE, Paulus W (2006)
Prognostic implications of atypical histologic features in choroid plexus papilloma.
J Neuropathol Exp Neurol 65: 1069-73

. Curative surgery is still possible, but the probability of recurrence appears to be higher.