One hundred and fifty-five tumours of the central nervous system which occurred in children in the north west of England during a period of nine years are analysed from a pathological point of view. It is probable that these represent over 90% of all such tumours occurring in the region at that time and that the relative incidence of various tumour types is, therefore, a true one: just over a fifth (35) were medulloblastomas; just under a fifth (29) were juvenile astrocytomas; a similar group (33) were of the adult astrocytic type; there were 24 ependymomas and 34 in miscellaneous minor groups.
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