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Functional endoscopic sinus surgery fess using sharp biting instruments and or a microdebrider has become the primary method of surgical therapy for chronic sinusitis. In the past sinus operations were done through incisions. Nasal And Sinus Surgery Los Angeles C V Ent Surgical Group Sinus Remedies Sinus Surgery Sinus Problems Functional endoscopic sinus surgery fess is a minimally invasive surgical procedure that opens up sinus air cells and sinus ostia openings with an endoscope. Functional endoscopic sinus surgery . Cuts in the face and mouth but endoscopic sinus surgery allows the operation to be performed without the need for these cuts. Functional endoscopic sinus surgery fess is a minimally invasive technique in which sinus air cells and sinus ostia are opened under direct visualization. A practice of anesthesia for infants and children sixth edition 2019. Endoscopic sinus surgery is the name given to operations for sinus problems when treatment with tablets or spra