Aeration of the middle ear cleft after tympanoplasty plays an important role in determining postoperative hearing and the recurrence of retraction cholesteatoma in patients with middle ear cholesteatoma.
We investigated reaeration in each child with cholesteatoma after operation, and examined the relationship between the extent of reaeration and various clinical factors
Forty children aged 10 years or under were included in this study. They underwent posterior canal wall reconstruction tympanoplasty for middle ear cholesteatoma during 1995-2001. We evaluated the extent of aeration of the middle ear about one year after the first operation based on temporal bone CT images. The extent of reaeration was classified into four categories;A) to the mastoid antrum, B) to the attic, C) to the mesotympanium, and D) no aeration. We also analyzed the aeration with respect to the various clinical factors in each child. As controls, the aeration of the middle ear of adult patients who underwent posterior canal wall reconstruction tympanoplasty for middle ear cholesteatoma was also investigated one year after the first operation.
The middle ear of the children was significantly well-aerated compared with the adults after tympanoplasty. The children with otitis media with effusion exhibited a significantly poor aeration of the middle ear postoperativery. The children with cholesteatoma localized in the mesotympanum or localized lateral to the ossicles showed significantly better aeration than those with big cholesteatoma extending to the entire attic or the antrum.
The present study clearly showed that reaeration of the middle ear is significantly better in children than in adults. This may be due to the fact that the middle ear is in the process of pneumatization in young children. The children with otitis media with effusion usually have eustachian tube dysfunction and are prone to respiratory infections which affect the reaeration of the middle ear. In children with cholesteatoma extending to the entire attic, to preserve the mucosa of the attic is usually difficult. Removal of the mucosa of the attic may delay the reaeration of the attic and the antrum.
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