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Congenital ossicular anomalies

Congenital anomalies of the ossicles are most frequently associated with external ear abnormalities also, although they can occur in isolation. 

They cause conductive hearing loss (CHL).

When bilateral they are most frequently genetic, with autosomal dominant inheritance, whereas unilateral anomalies are usually sporadic.

Isolated ossicular anomalies can be classified as

  • class I : stapedial ankylosis
  • class II : stapedial ankylosis with other associated anomalies
  • class III : ossicular anomalies withouth stapedial ankylosis
  • class IV : oval / round dysplasia

They are associated with numerous syndromes including

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