Endoscopic sinus surgery is a surgical procedure that is performed to remove sinus blockage. Obstruction of the sinuses can lead to sinusitis, which is accompanied by inflammation of the mucous membrane, pain, discharge and breathing problems. While visiting the office, the otolaryngologist uses a special endoscope to see and diagnose the sinuses as best as possible. This endoscope provides a better visualization of the environment inside the nose and sinuses, and together with the sinus scan, it often shows problems that cannot be recognized by appearance.