Endoscopic sinus surgery is a surgical method that has become widespread all over the world with the development of endoscopes that provide high quality images. Nasal endoscopes are optical instruments that allow access to narrow and dark areas inside the nasal cavity without making a visible incision from the outside. ⠀ ⠀⠀ ⠀ Endoscopic sinus surgery:⠀ ⠀⠀ ⠀ • Chronic sinusitis (not responding to medical treatment)⠀⠀ • Recurrent sinusitis (recurrent sinusitis)⠀⠀ • Nasal polyp⠀⠀ • Antrochoanal polyp⠀⠀ • Turbinate reduction (reduction of nasal flesh)⠀⠀ • Sinus mucocele⠀⠀ • Nasal and sinus tumors⠀⠀ • Choanal atresia⠀⠀ • Control of unstoppable nosebleeds⠀⠀ • Eustachian Tube Problems⠀⠀ • Dacryocystorhinostomy (treatment of tear duct obstruction)⠀⠀ • It is a method used all over the world in the treatment of cerebrospinal fluid leaks after trauma.⠀ ⠀⠀ ⠀ Since endoscopic sinus surgery is performed in close proximity to important organs such as the eye and brain, it should be performed by experienced people.