Type A: Normal tympanic membrane (TM) mobility. Type B: Flat tympanogram associated with fluid or perforation (will have large volume). Type C: Negative middle ear pressure such as from a retracted TM. Type AS: Very stiff noncompliant TM associated with TM sclerosis or otosclerosis. Type AD: Hypermobile usually associated with ossicular discontinuity.
Graphic 73425 Version 1.0
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