title: Loss of ipsidirectional quick phases of torsional nystagmus with a unilateral midbrain lesion.
abstract: We report a patient with a long-standing, unilateral lesion of the midbrain who showed ipsidirectional loss of torsional quick phases, impairment of all vertical eye movements and normal horizontal eye movements. The findings are consistent with recent reports of the effects of experimental lesions, in monkeys, of the rostral interstitial nucleus of the medial longitudinal fasciculus and the interstitial nucleus of Cajal.
authors.affiliation: Department of Neurology, Department of Veterans Affairs Medical Center, Cleveland, Ohio.
authors.forename: R J
authors.initials: RJ
authors.lastname: Leigh
authors.forename: S H
authors.initials: SH
authors.lastname: Seidman
authors.forename: M P
authors.initials: MP
authors.lastname: Grant
authors.forename: J P
authors.initials: JP
authors.lastname: Hanna
mesh_terms: D000368:Aged; D001927:Brain Diseases / Q000150:complications / Q000503:physiopathology; D005133:Eye Movements / Q000502:physiology; D006801:Humans; D008297:Male; D008636:Mesencephalon / Q000503:physiopathology; D009759:Nystagmus, Pathologic / Q000209:etiology* / Q000503:physiopathology; D012027:Reflex, Vestibulo-Ocular / Q000502:physiology