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Jahrsdoerfer grading system
| Anatomical structure | Score |
|---|---|
| Stapes bone | 2 |
| Oval window open | 1 |
| Middle ear space | 1 |
| Facial nerve | 1 |
| Malleus-incus complex | 1 |
| Mastoid pneumatization | 1 |
| Incus-stapes connection | 1 |
| Round window | 1 |
| External ear | 1 |
| Total possible score | 10 |
