[Pathohistological study of spontaneously-infected chronic otitis media in rats].
D000818:Animals; D002908:Chronic Disease; D004424:Ear Canal / Q000473:pathology; D004429:Ear Ossicles / Q000473:pathology; D007758:Ear, Inner / Q000473:pathology; D009092:Mucous Membrane / Q000473:pathology; D010033:Otitis Media / Q000473:pathology*; D051381:Rats