Otosclerosis is an internal ear disease that causes deafness. It consists of a particular form of progressive osteosis (rounded bone growth) that affects certain areas of the bone labyrinth.


There are 3 progressive phases characterized by anatomy-pathological alterations:

  1. Osteoid Congestion: The Haversian ducts (vascular bone tissue ducts) dilate;
  2. Spongiosis: osteoclastic resorption that results in a spongy appearance;
  3. Sclerosis: osteoblastic activity causes the irregular deposition of new osteo-fibrillary material.

The diagnosis must be done by means of timpanometry or with a surface tone audiometric examination.

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