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| Localization | Primitive IP | Relapsed IP |
|---|---|---|
| Frontal sinus | 10 (13.7%) | 2 (9.6%) |
| Middle meatus | 19 (26%) | 5 (23.8%) |
| Maxillar sinus | 16 (22%) | 6 (28.5%) |
| Sphenoethmoidal recess | 5 (6.8%) | 1 (4.8%) |
| Anterior and/or posterior ethmoid | 23 (31.5%) | 7 (33.3%) |
| Total | 73 | 21 |
IP: Inverted Papilloma.
