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J Korean Bal Soc. 2004 Dec;3(2):413-416. English. Case Report.
Kim JS , Choi KD , Koo JW , Oh K , Chang JH , Park KW , Lee DH , Han GC .
Department of Neurology, Seoul National University College of Medicine, Korea. jisookim@snu.ac.kr
Department of Otolaryngology-Head & Neck Surgery, Seoul National University College of Medicine, Korea.
Department of Neurology, Korea University School of Medicine, Korea.
Department of Otolaryngology-Head & Neck Surgery, Gachon Medical School, Korea.
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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