Sulcus vocalis is a common pathology in the population and can be observed at all ages. The accuracy of diagnosis seems to depend on the measurement of the sulcus depth and the histological characteristics. For this reason, tools and strategies should be established in living subjects for effective management of this challenging disorder.

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In conclusion, our findings indicate that anatomic variations are not rare in the course of lower CNs within the neck in relation to adjacent structures, and awareness of these variations together with knowledge of distance to certain anatomic landmarks may help the surgeon to identify lower CNs during neck surgery and prevent potential nerve injuries.

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Our columellar distance graphic can provide further improvement of surgeon confidence while performing endoscopic sinus surgery or skull base surgery.