Coronal section of CT PNS showing occlusion of left maxillary ostium (black arrow), moderate mucosal thickening in the left maxillary sinus with air-fluid level (orange arrow), moderate mucosal thickening of the left ethmoidal sinus (purple arrow), nasal septum deviated to right side (red arrow), mucosal hypertrophy of bilateral inferior and middle turbinates (left more than right shown by blue arrows)