seventies—rule ofJoe Segen2016-11-14T03:52:09+00:00
NEUROLOGY, ONCOLOGY, PATHOLOGY
A mnemonic which helps students at various levels of sophistication recall general details about primary brain tumours.
Rule of 70s for Brain Tumours
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
70% of tumours arise in the posterior fossa, 70% of those occurring under age 2 are medulloblastomas; 70% of supratentorial tumours are craniopharyngiomas
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