Fisch reported a staging system for patients with nsopharyngeal angiofibroma.
nasal cavity nasopharynx without bone destruction
bone destruction with invasion into pterygomaxillary fossa and paranasal sinuses
invasion into infratemporal fossa, orbit and parasellar region, but lateral to the cavernous sinus
invasion into cavernous sinus, region of the optic chiasm, and pituitary fossa
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