[A neoplasm arising from the choroid plexus. The distinction between choroid plexus papilloma and choroid plexus carcinoma is not always clear-cut, as some tumors show only one or few histological features of malignancy, e.g. increased mitotic activity. These tumors have been termed "atypical choroid plexus papilloma", but clear diagnostic criteria have not been established (WHO, 2000). ( NCI )]
UMLS (NCI) C1266176