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Tinnitus grading system for acoustic neuromas.
| Grade | Descriptions |
|---|---|
| Ⅰ | No tinnitus |
| Ⅱ | Intermittent or mild tinnitus, can only be heard when the ambient noise is low |
| Ⅲ | Persistent or moderate tinnitus, can be heard every day |
| Ⅳ | Persistent and severe tinnitus, interfere with work and sleep |
