IV.03 Medulloblastoma

PIV03b1 - Click here to make me bigger
PIV.03.b1 Desmoplastic medulloblastoma (HE x40). Clear islands with the characteristics of medulloblastoma and dark, collagen-rich areas containing small tumour cells. Collagen production is generally considered a reaction of the leptomeninges, which are frequently invaded by medulloblastoma. However, this tumour entity was long considered a "circumscribed sarcoma of the cerebellar arachnoid".