Abstract
Benign paroxysmal positional vertigo (BPPV) of lateral semicircular canal variantis characterized by geotropic nystagmus when the head is turned from supine to either lateral position.
Canalith repositioning methods were used on 7 cases of BPPV of lateral semicircular canal variant. The effect was as quick as is observed for BPPV of posterior canal type.
A case of this series presented ageotropic nystagmus when the head was turned from supine to either lateral position at first examination, but geotropic nystagmus was observed after 1 week. Canalith repositioning methods used on this case of geotropic nystagmus, and nystagmus and vertigo disappeared. This change in the direction of nystagmus seemed to indicate the conversion of cupulolithiasis to canalolithiasis.
