Table 6: Cannady’s et al. staging system about prognosis (as operationally defined by RR) for IP managed by advanced endoscopic techniques.

GroupLocation and spreadRecurrence rate

Group AIP confined to the nasal cavity, ethmoid sinus,
and medial maxillary sinus
3.0%
Group BIP with lateral maxillary sinus, sphenoid sinus,
or frontal sinus involvement
19.8%
Group CIP with extrasinus extension35.3%