CT relationship between the origins of inverted papilloma and areas of focal hyperostosis
| Origin of Inverted Papilloma Confirmed by Surgery | Cases* (n) | Focal Hyperostosis on CT | Coincidence of Focal Hyperostotic Area with Tumor Origin |
|---|---|---|---|
| Lateral nasal wall | 40 | 25 | 21 |
| Maxillary sinus | 19 | 11 | 11 |
| Anterior ethmoid sinus | 16 | 12 | 10 |
| Frontal sinus | 5 | 2 | 2 |
| Sphenoid sinus | 5 | 3 | 3 |
| Posterior ethmoid sinus | 2 | 1 | 1 |
| Septum | 2 | 1 | 1 |
* In 12 patients, tumor origin extended to more than one compartment of the sinonasal cavity.