Case Report: Chondroma Arising within a Mixed Glioma*†

A case is reported of a girl who had had 4 suboceipital craniotomies between February, 1957 and July, 1964. The tumor removed at the first two operations was entirely of glial nature (astrocytoma and ependymoma), but at the last two operations the mass contained increasing amounts of cartilaginous tissue. The chondroma appears to have arisen from a transformation of the gliomatous tumor. Such a development has also been reported by others.