In endoscopic sinus surgery, an endoscope is inserted into the nose, providing the doctor with an inside view of the sinuses. Endoscopic sinus surgery is used to relieve symptoms associated with Sinusitis, Septal deviations or turbinate hypertrophy, Nasal polyps. Endoscopic sinus surgery is designed to improve the drainage of the sinuses as well as to improve airflow through the nose. Surgical instruments are inserted alongside the endoscope. This allows the doctor to remove small amounts of bone or other material blocking the sinus openings and remove growths (polyps) of the mucous membrane. In some cases a laser is used to burn away tissue blocking the sinus opening. A small rotating burr that scrapes away tissue may also be used.