Journal of the Korean Balance Society  2005;4(1):49-52

Jerky Seesaw Nystagmus in Isolated Internuclear Ophthalmoplegia.

Kyungmi OH 1 ; Jae Hong CHANG ; Kun Woo PARK ; Dae Hie LEE ; Kwang Dong CHOI ; Ji Soo KIM

Affiliations

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Keywords

Seesaw nystagmus; Internuclear ophthalmoplegia

Country

Republic of Korea

Language

Korean

Abstract

The authors report jerky seesaw nystagmus, extorsional downbeating in the right eye and intorsional upbeating in the left eye, in a patient with right internuclear ophthalmoplegia (INO). This pattern of nystagmus may occur by disrupting pathways from contralateral posterior and anterior semicircular canals by a lesion in the medial longitudinal fasciculus. Depending on damage to the pathways from contralateral vertical canals, various patterns of dissociated torsional-vertical nystagmus may accompany INO.