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J Korean Bal Soc. 2005 Jun;4(1):49-52. Korean. Case Report.
Oh K , Chang JH , Park KW , Lee DH , Choi KD , Kim JS .
Department of Neurology, Korea University School of Medicine, Seoul, Korea.
Department of Neurology, Seoul National University College of Medicine, Seongnam, Korea. jisookim@snu.ac.kr
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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