J Korean Bal Soc.
2004 Dec;3(2):413-416.
Possible Mechanism of Seesaw Nystagmus in Internuclear Ophthalmoplegia
- Affiliations
-
- 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.
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.
