Abstract
It has been rcognized that the acute otitis media occurs in the middle ear with well-developed pneumatisation, and chronic otitis media in that with the under-developed pneumatisation. Also some authors reported that the catarrhal otitis media was seen in the middle ear with the under- developed pneumatisation. It is the purpose of this paper to study the difference in the inci- dence of the chronic otitis media and ca-tarrhal otitis in regard to the pneumatisation of the affected ears. Authors studied the pneumatisation rentgenologically on 64 cases of catarrhal otitis in which the transudation had been confirmed in the tympanic cavity. In 50% of all cases moderate pneumatisation was revealed. In 20.3% underdeveloped and in 29.7% welldeveloped pneumatisa- tion was seen. In regards to the classification of the pneumatisation, authors divided all cases into 6 groups, according to the grade of extention of the cell figures on the X-ray films and designated the middle two groups as the moderate pneumatisation.
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