Kennedy staging
| Stage | Description |
|---|---|
| 0 | Normal |
| I | Anatomic abnormalities, unilateral sinus disease, bilateral disease limited to ethmoid sinuses |
| II | Bilateral ethmoid disease with involvement of 1 dependent sinus |
| III | Bilateral ethmoidal disease with involvement of 2 or more dependent sinuses on each side |
| IV | Diffuse sinonasal polyposis |