Pathological state of destruction of stapes superstructure.

概要

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We examined the condition of the stapes in initial surgical cases (over 16 years old) in order to clarify what kind of otitis media induces stapes destruction. We also investigated the bone conduction hearing level in cases of stapes destruction. The subjects were cases of pars flaccida-type cholesteatoma (75 ears), pars tensa-type cholesteatoma (34 ears), pre-cholesteatoma (intermediate type between pars tensa cholesteatoma and adhesive otitis media, 20 ears), adhesive otitis media (48 ears) and simple perforated otitis media (266 ears). Destruction of the stapes superstructure was most frequently recognized in pars tensa cholesteatoma (73.5%), followed by pre-cholesteatoma (60%) and adhesive otitis media (39.7%). However, the incidence was low in pars flaccida cholesteatoma (17.3%), because the cholesteatoma matrix generally does not invaginate to the mesotympanum through the tympanic isthmus. There was no correlation between destruction of the stapes and the period of disease in our data. We surmise that bone conduction hearing loss is induced by disease of the oval and round window and progresses with advancing age.
耳鼻咽喉科展望会の論文