however , there are critics who restrict the indications , for two reasons : it has been observed repeatedly that the spontaneous healing rate in secretory otitis media is about 80 % , and follow up studies over several years suggest that persistent lesions of the middle ear ( scars and defects of the tympanic membrane , conductive hearing loss , cholesteatoma etc . ) occur somewhat more often in grommet-treated ears than in ears without ventilation tubes .
C0029883
secretory otitis media
C0013455
middle ear