CT scan PNS Findings: Minimal mucosal thickening is seen in bilateral maxillary, right frontal and sphenoid sinuses. Mild mucosal thickening is seen in bilateral ethmoid and left sphenoid sinuses. The bilateral maxillary ostia, right frontal recess and sphenoethmoid recesses are blocked due to mucosal thickening. The left frontal recess is patent. Subcentimetre sized bony lesion (8 x 6 x 9 mm in CC x AP x TR) is seen arising from the floor of the left frontal sinus and projecting into the left frontal sinus. Imaging features favour a frontal sinus osteoma. The nasal septum is deviated towards the left side with a bony spur on the left. The left middle turbinate is not well visualised. Suspected opacified right concha bullosa. Hypertrophy of the right inferior turbinate. Pls advise