[The treatment of benign paroxysmal positional vertigo of the lateral semicircular canal by positional manipulation].

A case of left horizontal-canal benign paroxysmal positional vertigo (HC-BPPV) in a woman with a 7-year history of episodic vertigo when turning over in bed is reported. The diagnosis was established with the patient lying down with her head raised 30 degrees with respect to the horizontal plane. Treatment with positional maneuvers (270 degrees contralateral head rotation in 3 steps) resolved the attacks. Positional testing failed to elicit symptoms 7 days, 14 days, 1 month, and 2 months after treatment. Four months after treatment, the patient remains asymptomatic. Published cases of HC-BPPV are discussed, as well as the differential diagnosis with posterior semicircular canal BPPV.