Endoscopic surgery of the frontal sinus without external approach.

Many surgical techniques have been described for the treatment of recurrent or persistent frontal sinusitis. The major difficulty of all techniques is to avoid recurrent stenosis of the frontonasal duct. Our endoscopic surgical technique without an external approach is described, which allows the creation of a bony and rigid frontonasal duct. Our first results seem to confirm the hypothesis that the creation of such a duct reduces the frequency of secondary stenosis and therefore the recurrencies of frontal sinusitis.