With an endoscope, the surgeon looks at a magnified view of the internal nose on a television monitor, and while doing so, removes diseased tissue and polyps and clears the narrow channels between the sinuses. New image guidance systems allow surgeons to achieve a much more complete removal of disease with much higher degree of safety. This is the safest way of doing things and allows for the most complete removal of disease. We are operating near to the undersurface of the brain and eyes.