Chronic rhinosinusitis (CRS) is an inflammatory condition of the nose and sinuses. It affects about 5 to 10% of Canadians. Patients suffer from congestion in the nose and sinuses, nasal discharge, pressure in the face, and a reduced sense of smell. This affects people's enjoyment of life. Medical management uses sprays or pills to treat these symptoms but for some patients sinus surgery is needed. This type of surgery is called endoscopic sinus surgery (ESS).