Endoscopic sinus surgery is an established modern type of sinus surgery with minimally invasive techniques utilising telescopes and small instruments to operate on sinuses through the nostrils. This operation is designed to unblock the sinuses around the nose, that allows drainage and ventilation of the sinuses, intended for people with chronic sinus problems. The aim is to widen the openings of the sinuses to remove sinus disease and also so that mucus does not get trapped.