A 38-year-old man presents with a 2-year history of progressive nasal obstruction and rhinorrhea. Nasal endoscopy reveals bilateral pale, gelatinous masses arising from the middle turbinate region. CT paranasal sinuses shows opacification of both maxillary and ethmoid sinuses with polypoid masses. The patient denies asthma, chronic cough, or recurrent sinusitis. What is the most appropriate next step in management?