Pathology of the eustachian tube.
D002908:Chronic Disease; D004427:Ear Diseases / Q000473:pathology; D004428:Ear Neoplasms / Q000473:pathology; D005064:Eustachian Tube; D005547:Foreign Bodies; D006801:Humans; D008854:Microscopy, Electron; D009336:Necrosis