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Combined perilymphatic fistulas of the round window and lateral semicircular canal. A report of 2 cases.

Two patients with combined perilymphatic fistulas of both the round window and the lateral semicircular canal are presented. They became asymptomatic only when both fistulas were closed. In both cases the hearing improved concurrently. It is recommended that when a traumatic perilymphatic fistula is not cured by closing window fistulas, the lateral semicircular canal be explored.