What is the definition or description of: sinus surgery?

Define Sinus Surgery: In simplest terms, sinus surgery is defined as making openings through the nasal passages and the four, paired sinuses on each side of the nose, bigger. This may include straightening a crooked (deviated) septum, reducing the size of the nasal turbinates, and making the openings (ostia) larger, using by means of a drill with a very small bit that removes bone around the sinus openings.

An operation....: Sinus surgery is an operation intended to decrease sinus problems whether they be recurrent infections or enlarged polyps. Sinus surgery is performed through the nose usually. The openings form the sinuses to the nose can be made larger. The chamber of the nose can be enlarged by removing turbinates.