Astroblastoma

This is a rare, as yet ungraded, cerebral tumor of childhood. It is composed of cells that are GFAP positive and have broad, non-tapering processes radiating toward central blood vessels (astroblastic pseudorosettes). The border with adjacent brain is pushing, not infiltrative. Hyalinized vessels (as seen below) are a hallmark of astroblastoma. No ependymal features have been identified in studies of this unusual entity.