seventies—rule of

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seventies—rule of2016-11-14T03:52:09+00:00

seventies—rule of 


A mnemonic which helps students at various levels of sophistication recall general details about primary brain tumours

Rule of 70s for Brain Tumours

• General

     70% are primary CNS neoplasms, 70% of primary CNS neoplasms are glial, 70% of primary glial tumours are astrocytomas; 70% of astrocytomas are high grade 

• Children

    70% of tumours arise in the posterior fossa, 70% of those occurring under age 2 are medulloblastomas; 70% of supratentorial tumours are craniopharyngiomas 

• Adults

    70% are in the cerebral hemispheres, 70% of pineal region tumours are germinomas, 70% of pituitary tumours are adenomas, of which 70% are chromophobe adenomas (a now-obsolete term)

Synonym 70s—rule of

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