Table 1.

Adam’s modified staging system

Stage	Tumor characteristics
T1	Confined to one nasal passage, paranasal sinus, or frontal sinus with no bony involvement.
T2	Any bony involvement, but no evidence of orbital, subcutaneous, or submucosal mass.
T3	Involvement of orbit or subcutaneous or submucosal mass.
T4	Tumor extension into nasopharynx or cribriform plate.