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To assess all different patterns of associated abnormalities on audiometry, bithermal caloric test (BCT) and cervical/ocular vestibular-evoked myogenic potentials (VEMPs) to air/bone-conduction in patients with selective posterior semicircular canal (PSC) hypofunction and to correlate them with underlying disorders. Retrospective review. Tertiary referral center. 51 patients (23 men, 28 women, mean age 57.5 yr) with isolated PSC deficit (one bilateral). Correlation with instrumental data and underlying diagnoses.