Tympanosclerosis

• Punctate, linear, plaque-like, or web-like mineralization in the tympanic membrane on high-resolution CT
• Calcified deposits in the middle ear/epitympanic region that may contact or bridge the ossicular chain
• Ossicular thickening and epitympanic narrowing accompanying the mineralization

• High-resolution temporal bone CT demonstrates variable mineralization patterns ranging from punctate to plaque-like or web-like calcifications within the tympanic membrane (myringosclerosis when confined to membrane alone).
• Mineralization may involve the tympanic cavity and middle-ear soft tissues, including ossicular ligaments, interosseous joints, and muscle tendons, causing ossicular fixation and conductive hearing loss.
• Epitympanic narrowing and ossicular thickening commonly accompany the calcific deposits, which may appear to abut or bridge ossicles to adjacent middle-ear walls.
• Distribution patterns include isolated tympanic membrane involvement (50%), isolated middle-ear cavity involvement (~30%), or combined tympanic membrane and middle-ear involvement (~20%).
• Key distinguishing feature from otosclerosis: tympanosclerosis affects soft tissues and ossicles of the middle ear, whereas otosclerosis is an otic-capsule process centered near the fissula ante fenestram.
• Tympanosclerosis may be associated with chronic otomastoiditis, in which case it is termed chronic otomastoiditis with tympanosclerosis.
• CT can show mineralization patterns suggesting ossicular fixation, but functional effects require clinical and audiologic correlation to confirm hearing loss severity.
• Distinction from ossicular erosion or discontinuity is important: tympanosclerosis shows mineralization and fixation rather than loss of ossicular continuity.

• Otosclerosis: Distinguished by otic-capsule location centered near the fissula ante fenestram, rather than tympanic membrane and middle-ear soft tissue involvement.
• Ossicular discontinuity or erosion: Tympanosclerosis shows mineralization and fixation pattern rather than loss of ossicular bone continuity.
• Chronic otomastoiditis alone: Tympanosclerosis includes the characteristic calcific plaques and mineralization of tympanic and middle-ear tissues beyond simple inflammation.
• Ossicular fixation from other causes (stapes fixation, oval window pathology): Tympanosclerosis presents with characteristic calcific deposits in specific locations rather than primary stapes footplate involvement.

Describe location (tympanic membrane, epitympanum, or specific ossicle), morphology (punctate, plaque, or web-like), and extent; specify whether mineralization contacts or bridges the ossicular chain, and note any associated ossicular thickening or epitympanic narrowing—then recommend audiometric correlation to quantify functional impact.

• Confusing tympanosclerosis with otosclerosis: remember that tympanosclerosis affects the tympanic membrane and middle-ear soft tissues, while otosclerosis is an otic-capsule process near the fissula ante fenestram.
• Overinterpreting small punctate calcifications as clinically significant ossicular fixation without audiologic correlation; CT mineralization must be correlated with functional hearing loss.
• Missing associated chronic otomastoiditis that may indicate more aggressive disease requiring different management than isolated tympanosclerosis.
• Failing to distinguish mineralization from true ossicular discontinuity or erosion, which would indicate different underlying pathology and prognosis.