a 69-year-old man had a melanotic primitive neuroectodermal tumor of the medulla displaying various neuroepithelial elements including undifferentiated neuroepithelial cells forming homer wright 's rosettes as well as neoplastic neuroglia resembling those seen in medulloblastoma .
C0206094
melanotic primitive neuroectodermal tumor
C1449624
neuroepithelial cells