Several types of flap techniques have been developed to cover exposed bone after Draf procedures to reduce the possibility of re-stenosis. These techniques are relatively new and detailed measurements of the size of neo-Ostia during follow-up have not been reported. The authors aim to assess outcomes precisely by not only using endoscopic evaluation but also by measuring the diameter of the ostium and the thickness of the nasal beaks on pre- and postoperative computed tomography images. The authors reviewed 25 patients with 37 nasal cavities who have undergone a Draf surgery with a previously-reported superior lateral anterior pedicle flap technique. The anteroposterior (AP) distance of the frontal recess and the thickness of the nasal beaks were measured before, immediately after, and more than 6 months after surgery. Measured distances were statistically analyzed. The neo-ostium remained patent in long-term follow-up of all patients. The AP distance of the frontal recess and the thickness of the nasal beak were preserved during follow-up. Neither synechiae nor orbital injuries occurred. In conclusion, Draf type II and III procedures with superior lateral anterior pedicle flaps are safe and effective. Neo-Ostia remained patent throughout the follow-up period.