Journal of the Korean Balance Society  2004;3(2):413-416

Possible Mechanism of Seesaw Nystagmus in Internuclear Ophthalmoplegia.

Ji Soo KIM 1 ; Kwang Dong CHOI ; Ja Won KOO ; Kyungmi OH ; Jae Hong CHANG ; Kun Woo PARK ; Dae Hie LEE ; Gyu Cheol HAN

Affiliations

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Keywords

Internuclear ophthalmoplegia; Seesaw nystagmus

Country

Republic of Korea

Language

English

Abstract

The authors report jerky seesaw nystagmus, extorsional downbeating in the ipsilesional eye and intorsional upbeating in the contralesional eye, in a patient with internuclear ophthalmoplegia (INO) from focal pontine lesion. 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 the pathways involved, various patterns of dissociated torsional-vertical nystagmus may accompany INO.