?:definition
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Pineoblastoma is a rare primitive neuroectodermal tumour (PNET) arising in the pineal gland. Pineoblastomas are classified as a WHO grade IV tumour and comprise one-fourth to one-half of pineal parenchymal tumours. Pineoblastoma is a highly cellular tumor originating in the pineal gland and containing small, poorly differentiated cells. [HPO:probinson, PMID:21717450]
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