FESS means

Ans. d (Functional endoscopic sinus surgery), (Ref. Scott Brown, Otolaryngology, 6th ed., 12, 29)Functional Endoscopic Sinus Surgery (FESS) is based on the philosophical concept that function can be restored to the paranasal sinuses and normal structures can be preserved through removal of minimal amounts of tissue. This concept embodies a new understanding of the pathophysiology and development of sinus disease and requires a more delicate, minirealist approach to sinus surgery than the extirpative procedures of the past. These techniques were developed by Walter Messerklinger of Graz, Austria. Uncinectomy is 1st step of FESS.