label: Pineoblastoma
label_lc: pineoblastoma
description: "Pineoblastoma is a rare primitive neuroectodermal tumor (PNET) arising in the pineal gland. Pineoblastomas are classified as a WHO grade IV tumor and comprise one-fourth to one-half of pineal parenchymal tumors. Pineoblastoma is a highly cellular tumor originating in the pineal gland and containing small, poorly differentiated cells."