Abstract
Pure tone audiograms of eighty-one ears withcholesteatoma otitis operated in our departmentfrom 1984 to 1993 were studied, and comparedwith those of thirty-six ears with otitis mediachronica (the cases without cholesteatoma).
Bone conduction threshold of the opposite earin these all cases is within normal range at theaudiometory before operation.
As a result, bone conduction threshold and air-bone gap of the cases with cholesteatoma otitisshowed a tendency to increase, as being prolongedof their courses and compared with thoseof the ears of otitis media chronica.
Flat type audiograms were shown more frequentlyin the cases with cholesteatoma otitis, onthe other hand the low tone type was shown morefrequently in the cases with otitis media chronica.
The cases with increasing bone conductionthreshold were shown more frequently in thecases with cholesteatoma of tympanic cavity andin the cases with their course more than tenyears.
