Endoscopic sinus surgery involves use of rigid endoscopes along with specialized instruments to remove cause of obstruction to sinuses and also openings of sinuses will be widened with various instruments. This is a minimally invasive procedure and in good hands has got minimal complications and good outcome Regarding cure rate endoscopic sinus surgery has got fairly good cure rates though its not 100 percent. Usually maximal medical therapy is indicated before going ahead with surgery There won't be any swelling after routine endoscopic surgery