The Draft 3 procedure has been demonstrated to be effective in the treatment of refractory frontal sinus disease. Imaging plays a vital role in the evaluation and follow-up after surgery and provides useful prognostic information.

Researchers conducted this study to investigate the influence of local anatomic factors on FNO after a Draf 3 procedure by radiological measurements on imaging software and explore other predictive factors of FNO restenosis.

A significant association was demonstrated between the minimum anteroposterior diameter (FOAPMIN) of the frontal ostium preoperatively and the FNO area 1 year postoperatively. Multivariate linear regression showed that FOAPMIN of the frontal ostium preoperatively and the percentage of EOSs correlated with the FNO 1 year’s contour area postoperatively. FOAPMIN ≤ 3.592 mm yielded a sensitivity of 95% and a specificity of 75% for FNO restenosis diagnosis.

The study concluded that both FOAPMIN and EOS are independent predictors of the contour area of the FNO 1 year postoperatively. Patients with a higher risk of developing frontal ostium restenosis can be identified preoperatively by measurements of the frontal sinus anatomic dimensions.