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- Case Report Possible Mechanism of Seesaw Nystagmus in Internuclear Ophthalmoplegia
- Ji Soo Kim, Kwang Dong Choi, Ja Won Koo, Kyungmi Oh, Jae Hong Chang, Kun Woo Park, Dae Hie Lee, Gyu Cheol Han
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DOI: https://doi.org/
1Department of Neurology, Seoul National University College of Medicine, Korea. jisookim@snu.ac.kr 
2Department of Otolaryngology-Head & Neck Surgery, Seoul National University College of Medicine, Korea.
3Department of Neurology, Korea University School of Medicine, Korea.
4Department of Otolaryngology-Head & Neck Surgery, Gachon Medical School, Korea.
2Department of Otolaryngology-Head & Neck Surgery, Seoul National University College of Medicine, Korea.
3Department of Neurology, Korea University School of Medicine, Korea.
4Department of Otolaryngology-Head & Neck Surgery, Gachon Medical School, Korea.
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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.
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