title: Congenital abnormalities in the ossicular chain in routine tympanotomy operation.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D004429:Ear Ossicles / Q000002:abnormalities*; D005260:Female; D006801:Humans; D008297:Male; D013201:Stapes Surgery / Q000379:methods*; D014432:Tympanic Membrane / Q000601:surgery*