title: Idiopathic haemotympanum and mastoiditis nigra.
mesh_terms: D004194:Disease; D004427:Ear Diseases; D004432:Ear, Middle; D006801:Humans; D008417:Mastoiditis / Q000209:etiology*; D014432:Tympanic Membrane
keywords: EAR, MIDDLE/diseases; MASTOIDITIS/etiology