Succinct key points
  1. GM is a troublesome disease with vague symptoms and hard to eradicate by conservative treatment.
  2. Most of the GM cases had previous otologic surgery history, and the most common symptom was otorrhea.
  3. Mention to the recurrence of GM, CO2 laser and causative agents had comparable results.
  4. We suggest CO2 laser can be the first line treatment in refractory GM.
  5. Ear drops had poor efficacy compared to other treatments, which should be apply only on minor and fresh symptom cases.