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Fig. 1.   Secondary structures of Scherer demonstrating migration of glioma cells through normal brain structures. (A) Glioma cells surrounding blood vessels (perivascular satellitosis) (arrow). (B) Perineuronal satellitosis (arrow). (C) Collection of cells below pial surface (subpial spread) (arrow). (D) Intrafascicular spread of tumor cells through the corona radiata.