鼓室硬化症例の検討

抄録

A review of operation records of 571 cases with chronic otitits media for an attempt to study tympanosclerosis revealed the following; 1. the incidence of tympanosclerotic lesions was greater in simple chronic otitis media than in cases with cholesteatoma or adhesive otitis, 2. male to female ratio was 2 to 1, 3. tympanosclerotic lesions of the eardrum, in most cases, were associated with the same lesions within the middle ear. 4. tympanosclerosis was confined to the pars tensa and in no case occurred in the pars fiaccida, 5. the lesion in the tympanum was frequently seen at stapes-oval window area, I-S joint and attic. 6. in the majority of cases the tympanosclerosis was associated with thin and dry middle ear mucosa, 7. audiograms of the ear with tympanosclerosis showed stiffness curves.