Endoscopic surgery of the paranasal sinuses has become popular during recent years, but the endonasal approach into the frontal sinus was only rarely recommended. Using a surgical endoscope with 70° optical deflection, the fenestration of the frontal sinus from below has proved a valuable and safe procedure in more than 500 procedures. The control of complications like osteitis and mucopyoceles, and of foreign bodies and benign tumors has become practical with endoscopic exposure.
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