Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2023 May 4;55(Suppl 1):E698–E699. doi: 10.1055/a-2062-5718

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

PMC Copyright notice

Fig. 2 — The “echo-free space” method. a First, advance the endoscopic ultrasound (EUS) scope in front of the pyloric ring (arrows) and search for the lumen of the duodenal bulb, which is depicted as an echo-free space (*) on EUS. b Next, search for the site where the continuity of the intestinal wall adjacent to the echo-free space (*) is interrupted (arrow). This part would be the pyloric ring. c Aligning the tip of the scope with the discontinuity on the EUS screen will lead to successful insertion of the EUS scope into the pylorus.