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HOME > J Korean Bal Soc > Volume 5(1); 2006 > Article
Case Report Horizontal Canal Benign Paroxysmal Positional Vertigo in Caloric Dead Labyrinth
Jae Jin Song, Yong Hwi Ahn, Ji Soo Kim, Ja Won Koo

1Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University College of Medicine, Seoul, Korea.
2Department of Neurology, Seoul National University College of Medicine, Seoul, Korea.
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The presence of functioning semicircular canal is regarded as a prerequisite for the development of benign paroxysmal positional vertigo (BPPV) since BPPV is irritative vestibulopathy. However, authors experienced a case of horizontal semicircular canal BPPV in which bithermal caloric test and ice water test were compatible with complete canal paralysis. Forty eight year-old man visited ER for sudden onset of vertigo and right hearing loss developed 3hours and 4 hours ago, respectively. Vertigo was vaguely complained and was floating in nature, which was aggravated with head position change. Initial audiometry showed 110 dB on pure tone averages. Positional test showed horizontal geotropic direction changing positional nystagmus and it was compatible with canalolithias of right horizontal semicircular canal. The results of initial and follow up bithermal caloric tests and ice water test on supine and prone position were compatible with right side complete canal paralysis. This case implies that caloric dead labyrinth may not represent complete absence of the lateral semicircular canal function and also BPPV can be developed even in a condition with minimal functional remaining. Key Words : Positional vertigo, Caloric test

Res Vestib Sci : Research in Vestibular Science