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.
On a clockwise rotation to either side the rings of the trachea can be more easily appreciated (yellow arrows). The pretracheal space lies in front of the trachea and may be difficult to visualize by EUS; a transcutaneous ultrasound can give more information
