Fifty-nine cases of tympanosclerosis were investigated clinically and pathologically, and the following results were obtained:
1) The male to female ratio was about 1: 1.8
2) Calcification in the tympanic membrane was most common in the upper quadrants of the pars tensa, and never seen in the pars flaccida.
3) Calcification in the middle ear cavity was most common around the malleus.
4) Chronic otitis media was the most common complication of tympanosclerosis.
5) Preoperative audiometry revealed a stiffness curve with elevated bone conduction thresholds.
6) 54% of the patient had chronic otitis media in the contralateral ear.
7) Microscopic examination revealed calcification in the submucosa of the middle ear.
8) Postoperative hearing was improved in 49 ears (79.7%). Because there was no difference in the average postoperative hearing gain after type I and type III tympanoplasty, type III tympanoplasty is recomended to remove sclerotic masses completely.