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To examine the long-term results of extended endoscopic frontal sinus surgery, including removal of the floor of the frontal sinus (Draf type II procedure) and the median drainage operation (Draf type III procedure or modified Lothrop procedure), for obstructive frontal sinusitis caused by postoperative scar formation, with the emphasis on the long-term success of the median drainage procedure.

Extended Endoscopic Frontal Sinus Surgery to Interrupted Nasofrontal Communication Caused by Scarring of the Anterior Ethmoid