Cannady’s et al. staging system about prognosis (as operationally defined by RR) for IP managed by advanced endoscopic techniques.
|Group||Location and spread||Recurrence rate|
|Group A||IP confined to the nasal cavity, ethmoid sinus,|
and medial maxillary sinus
|Group B||IP with lateral maxillary sinus, sphenoid sinus,|
or frontal sinus involvement
|Group C||IP with extrasinus extension||35.3%|