IN A RECENT survey of 97 consecutive cases of verified medulloblastomas, we noted that 30 patients were 16 years of age or older (fig. 1). The syndrome of the cerebellar medulloblastoma in childhood has been repeatedly emphasized, whereas the occurrence of similar tumors in the adult has received scant attention in the literature. Cushing,1in 1930, reported 61 cases of medulloblastoma, in 21 per cent of which, or 13, the patients were over the age of 16. Ten patients were between the ages of 16 and 30, and 3 were in the age group over 30. His oldest patient was 38. Dyke and Davidoff2discussed a series of 16 cases of verified medulloblastoma, in which the oldest patient was 24 years of age. They were impressed with the fact that 3 of their 16 patients were over 20 years of age. In our own series, of 97 patients,