Modern external and endonasal surgery of the paranasal sinuses began roughly at the turn of the twentieth century [8, 25]. At the beginning of this new period, only a few surgeons were able to perform a successful endonasal ethmoidectomy and simple drainage of the frontal sinus. In the preantibiotic and preendoscopic period, endonasal surgery of the paranasal sinuses was a life-threatening treatment with a high incidence of catastrophic complications like meningitis, brain abscess, and encephalitis. This was the reason why for many decades most of rhinologists preferred the external approach for paranasal sinus surgery. With the development of new optical aids, mainly endoscopes and the operating microscope, a new revolutionary era started between the 1950s and the 1970s. Further improved understanding of the pathophysiology of paranasal sinus mucosa played an important role in the rebirth of endonasal sinus surgery [3, 9, 20].