The recurrent cerebellar astrocytoma

5 children with six recurrences of cerebellar astrocytoma are reviewed. The clinical course is correlated with the grading system of Gilles for posterior fossa gliomas. Changes in the Gilles classification were found in some tumors at the time of reoperation. The delayed occurrence of hydrocephalus signified recurrence of tumor. Regardless of the apparent histologic benignity of the tumors, cerebellar astrocytomas have the capacity to regrow even after apparent total removal. Routine follow-up CT scans should be performed to detect asymptomatic recurrences.