In 1976 a patient underwent partial resection of an intraventricular t
umor that showed central neurocytoma. No other tumor pattern was obser
ved. In 1994 this patient underwent a second operation for removal of
the tumor, at which time foci of tumor were diagnosed as central neuro
cytoma and ganglioglioma. This is the first reported case of different
iation of central neurocytoma into ganglioglioma, a sequence of events
termed differentiating central neurocytoma.