What condition might a tympanogram with normal pressure and low compliance suggest?

A tympanogram that shows normal pressure but low compliance typically indicates a stiff or non-compliant middle ear system. This situation is consistent with otosclerosis, a condition where abnormal bone growth in the middle ear affects the ossicles (the small bones responsible for transmitting sound). In otosclerosis, the stapes bone may become immobilized, leading to reduced mobility and compliance in the tympanic membrane's response to pressure changes.

Fluid in the ear usually presents with a type B tympanogram characterized by flat tracing that indicates effusion or fluid buildup, while normal ear function is typically associated with both normal pressure and high compliance. Earwax can lead to type C or even type B results, but it does not specifically correlate with low compliance under normal pressure conditions like otosclerosis does. Therefore, a tympanogram with normal pressure and low compliance is primarily indicative of otosclerosis.