A 38-year-old man from Delhi presents with a 2-year history of progressive nasal obstruction and recurrent rhinosinusitis. On nasal endoscopy, multiple pale, smooth, glistening polyps are seen bilaterally in the nasal cavity and extending into the maxillary sinuses. He has no history of asthma or aspirin sensitivity. CT PNS shows opacification of bilateral maxillary and ethmoid sinuses with polypoidal masses. Which of the following is the most likely diagnosis?