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Kelly criteria for CSF rhinorrhoea
| CSF leakage classification | Description |
|---|---|
| Grade 0 | No CSF rhinorrhoea, confirmed by Valsalva manoeuvre |
| Grade 1 | CSF rhinorrhoea as small as teardrops, confirmed by Valsalva manoeuvre |
| Grade 2 | Moderate CSF rhinorrhoea with obvious saddle septum defect |
| Grade 3 | Major CSF rhinorrhoea, large saddle septal defect |
