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HOME > J Korean Bal Soc > Volume 3(2); 2004 > Article
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

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.
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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.


Res Vestib Sci : Research in Vestibular Science