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- Case Report Jerky Seesaw Nystagmus in Isolated Internuclear Ophthalmoplegia
- Kyungmi Oh, Jae Hong Chang, Kun Woo Park, Dae Hie Lee, Kwang Dong Choi, Ji Soo Kim
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DOI: https://doi.org/
1Department of Neurology, Korea University School of Medicine, Seoul, Korea. 
2Department of Neurology, Seoul National University College of Medicine, Seongnam, Korea. jisookim@snu.ac.kr
2Department of Neurology, Seoul National University College of Medicine, Seongnam, Korea. jisookim@snu.ac.kr
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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.
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