 Kennedy published multiple papers on FESS use and technique, and in 1985 the first course on FESS was taught at Johns Hopkins Medical Center.Functional Endoscopic Sinus Surgery is most commonly used to treat chronic rhinosinusitis, only after all non-surgical treatment options such as antibiotics, topical nasal corticosteroids, and nasal lavage with saline solutions have been exhausted.Chronic rhinosinusitis (CRS) is an inflammatory condition in which the nose and at least one sinus become swollen and interfere with mucus drainage.