 63 y/o RHF first seen by Neurology on 9/14/71 for complaint of episodic vertigo. During that evaluation she described a several year history of "migraine" headaches. She experienced her first episode of vertigo in 1969. The vertigo (clockwise) typically began suddenly after lying down, and was not associated with nausea/vomiting/headache. The vertigo had not been consistently associated with positional change and could last hours to days.