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A case of congenital ossicular dislocation diagnosed by a sweep frequency tympanometry

A case of congenital ossicular dislocation diagnosed by a sweep frequency tympanometry

Jibi Inkoka Tokeibu Geka 63(9): 711-715

A 19-year-old female complained of a non-progressive hearing loss in the left ear. Otoscopy revealed no abnormal finding in the external ear and the ear drum. Audiometry showed 48 dB A-B gap. The tympanogram was A-type with no strapedial reflex. It was impossible to determine the pathology of the ossicular chain by target CT. By the sweep frequency tympanometry, ossicular dislocation was strongly suggested because of abnormal values of B-, Z- and P-points. This was confirmed by surgery. The hearing and the sweep frequency tympanogram improved up to normal range after the operation. The authors feel that the sweep frequency tympanogram is useful for the diagnosis and the preoperative preparation in ossicular abnormalities.

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