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SYNOPSIS

Two patients are presented who developed classical migraine in association with raised intracranial pressure due to a colloid cyst of the third ventricle and a presumed brain stem tumor. Although intraventricular tumours have been claimed to occasionally produce migrainous attacks, brain stem and posterior fossa masses have not been regarded as having this potential. Obstructive hydrocephalus was probably the common mechanism and this should be recognized as a rare cause of migraine.