fenestration operation

fen·es·tra·tion op·er·a·tion

a rarely used surgical procedure producing an opening in the horizontal semicircular canal through a mastoid cavity to improve hearing in hearing impairment of the conduction type due to otosclerosis.
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2] In 1952, Rosen gained recognition for rediscovering mobilization during a fenestration operation, and he reintroduced it as a treatment for otosclerosis.