A 28-year-old woman with a 6-year history of progressive hearing loss and intermittent foul-smelling otorrhea from the right ear presents with positive Hennebert sign. Otoscopy reveals a retraction pocket in the pars flaccida filled with white keratin debris consistent with cholesteatoma. Pure-tone audiometry of the right ear shows the pattern marked **A** in the diagram. High-resolution CT temporal bone demonstrates erosion of the long process of the incus and a 2 mm fistula in the lateral semicircular canal. Which of the following best explains the audiological finding marked **A**?
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