the `` '' concrete '' '' histological criteria for establishing the benignity or malignancy of cerebral tumours of neuroectodermic origin ( gliomas and medulloblastomas , respectively granulocytomas ) may be thus synthetized : 1 ) the benign tumours have a fibrocellular structure , the neoplastic cells being relatively monomorphous ;
C0017638
( gliom
C0025149
medulloblastom