FESS Procedures - What to Expect | Medtronic
https://www.medtronic.com/us-en/patients/treatments-therapies/sinus-surgery/functional-endoscopic-sinus-surgery/what-to-expect.html
WebDURING SURGERY. FESS procedures are usually done under general anesthesia. The procedure can last from 1 to 3 hours, depending on your particular condition. THE ETHMOIDECTOMY PROCEDURE. During an ethmoidectomy, your Ear, Nose, and Throat (ENT) surgeon passes a narrow tube called an endoscope into your nose.
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