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Tympanosclerosis of the drum, which signifies hyaline degeneration of the fibrous and elastic fibres in the lamina propria, is extremely frequent in chronic otitis and its sequelae, as well as after secretory otitis. In various studies comprising children with secretory otitis treated with intubation, the frequency of tympanosclerosis of the drum varies between 25-33 per cent (Mackinnon

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Repetitive screening tympanometry performed in 240 healthy 2-year-old children showed that tympanometric conditions are significantly better in the summer season than in the spring or winter. A very large tendency to spontaneous normalization of the tympanogram type B was demonstrated. Only 16% of the ears that had type B at the first investigation in November had the same type in August. Simultaneous with the normalization of some ears others deteriorated, thus in November type B tympanogram was found in 12%, in February 14.6%, in May 11.3%, and in August 7.2% of all ears investigated. Due to the large variability in the tympanometric conditions which are predominantly caused by catarrhalia, 28.6% of the ears have had type B tympanogram at least once during the period from November to August, while only 1.6% have had type B at all four investigations. The large spontaneous recovery of secretory otitis, demonstrated in the present study, indicates that the child should be observed for a period before implementation of surgical treatment.

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