Functional Endoscopic Sinus Surgery (FESS) – This minimally invasive outpatient procedure involves the use of a nasal endoscope and specialized instruments to restore the anatomic drainage pathways of the paranasal sinuses to a more natural configuration. Polyps and infectious material are removed and analyzed in the laboratory in order to individualize treatment options for each patient. In complex situations this procedure is tied to a computer navigation protocol where the sinonasal instruments are calibrated against the patient’s.