=====Endoscopic Frontal Sinusotomy=====
Endoscopic frontal sinusotomy, or Draf II procedure, is indicated for patients with severe forms of chronic frontal sinus disease that have failed after endoscopic frontal recess approach. This extended drainage procedure involves resection of the floor of the frontal sinus from the nasal septum medially, to the lamina papyracea laterally. The dissection involves removal of the anterior face of the frontal recess. Thus, the frontal sinus ostium is enlarged to its maximum dimension. This procedure can be very difficult to distinguish from the endoscopic frontal recess approach (Draf I) on coronal postoperative imaging. Evaluation of multiple consecutive coronal images or sagittal reformatted images can demonstrate extensive removal of the anterior face of the frontal recess and frontal sinus floor when compared to the frontal recess approach. The endoscopic frontal sinusotomy (Draf II) procedure can be easily distinguished from the Draf III procedure by the lack of resection of the superior nasal septum and entire frontal sinus floor.