Lund–Mackay score assessment
The Lund–Mackay method was used to assess the HRCT images of chronic rhinosinusitis. Right and left sides were each grouped into six sinus areas including maxillay, anterior ethmoidal, posterior ethmoidal, sphenoid, frontal, and ostiomeatal complex. The severity of sinus mucosa opacification was scored as 0 (with no abnormality), 1 (partial opacification), or 2 (complete opacification). The ostiomeatal complex was assigned a score of either 0 (not obstructed) or 2 (obstructed).