Histologically, a prominent feature are their perivascular pseudorosettes, which are ring-like structures formed by tumors cells with rod-shaped ependymal processes, like cilia, surrounding a centralized blood vessel.

从组织学上看，主要的特征是血周假菊，膜瘤细胞的棒状突起（如纤毛）成的环状结构，围绕着中央的血。