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. 2020 Jul 31;24(3):e364–e375. doi: 10.1055/s-0040-1713923

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This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.

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Fig. 7 — Endoscopic view of a Draf III as a step for a transcribriform approach. ( A ) view of the cribriform plate and frontal recess. ( B ) bilateral identification of the first olfactory fiber, ( C ) view after partial drilling of the frontal sinus floor, ( D ) drilling of the bony junction between the two frontal sinus, ( E ) visualization of the left frontal sinus, ( F ) view after communicating both frontal sinuses, ( G ) further drilling of the anterior table of the frontal sinus, ( H ) and ( I ) final aspect after a complete drill out of the frontal sinuses.