Eustachian tube bypass.
D000328:Adult; D002781:Cholesteatoma / Q000601:surgery*; D002908:Chronic Disease; D004427:Ear Diseases / Q000601:surgery*; D005064:Eustachian Tube / Q000601:surgery*; D006801:Humans; D008297:Male; D008876:Middle Ear Ventilation / Q000379:methods*