Tympanic membrane changes after repeated insertions of ventilation tubes.
D000818:Animals; D002921:Cicatrix / Q000473:pathology; D004848:Epithelium / Q000473:pathology; D008297:Male; D008876:Middle Ear Ventilation / Q000009:adverse effects; D051381:Rats; D011919:Rats, Inbred Strains; D013997:Time Factors; D014432:Tympanic Membrane / Q000473:pathology*