=Cause.=—Always from unsuccessfully treated acute form or from chronic
suppurative otitis media.
=Non-surgical treatment.=—See chronic suppurative otitis media. We have
had a few cases that were seemingly permanently cured by non-surgical
treatment, but believe they are rare.
=Indications for Operation.=—1. Recurrent exacerbation of acute or
chronic otitis media.
2. Constant discharge which resists treatment for chronic suppurative
otitis media.
3. Continued pain or recurrent pain and swelling following acute otitis
media.