Disseminated Oligodendroglioma

Oligodendroglia was defined by del Rio Hortega1in 1921. Three years later, Bailey and Hiller2suggested that certain gliomas were composed of oligodendrocytes. In 1926, Bailey and Cushing3set apart a group of brain tumors as oligodendrogliomas; this publication was soon followed by several reports of similar tumors (Dickson,4Schaffer5and Thomas and Jumentié6). That such tumors were composed of cells which were impregnated like normal oligodendrocytes by del Rio Hortega's method was shown first by Bailey and Bucy.7Thus, oligodendroglioma was established as an entity. The average incidence of oligodendroglioma in the cases of glioma reported by Bailey8; Baker9; Elvidge, Penfield and Cone10; Gagel11; Környey,12and Löwenberg and Waggoner13was 3.4 per cent (74 of 2,131), ranging from 1.3 per cent of Gagel's series to 8.4 per cent of Környey's cases. From the beginning, it has