mucosal polyps occupying and obliterating the nasal cavity and the paranasal sinuses they are hypodense but may be hyperdense due to increased protein content or fungal infection associated local benign bone remodeling or erosion (as opposed to a mucocele where the entire sinus is expanded 6) enlargement of infundibula attenuation of the ethmoid sinus walls and nasal septum occasionally sparing the inferior nasal meatus truncation of middle turbinate opacified ethmoid sinuses with convex lateral walls and gas-fluid levels a concurrent fungal sinus infection may be present