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. 2020 May 12;13(4):389–395. doi: 10.21053/ceo.2019.01305

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Copyright © 2020 by Korean Society of Otorhinolaryngology-Head and Neck Surgery

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 2. — (A) Intraoperative view showing the insertion depth of the catheter tip as confirmed during a balloon Eustachian tuboplasty procedure. The catheter tip was advanced until its tip reached the isthmus. The on-screen crosshair provided real-time localization in three dimensions. Intraoperative view showing the internal carotid artery (asterisks). (B) Endoscopic photograph of catheter tip insertion over a black proximal endoscopic marker (denoting canalization of the cartilaginous segment of the Eustachian tube).