Your physician uses an endoscope (a long, flexible tube) with a small ultrasound transducer on the tip to obtain images of the lymph nodes deep in the chest. This instrument is passed into your esophagus. The transducer sends high-frequency sound waves to the organs to create detailed images of them. You should avoid food and drink for at least 6 hours before the procedure, and you will be sedated, so you should not drive or return to work for 24 hours.

### Preparation Instructions

- [Upper EUS](https://www.bmc.org/sites/default/files/Patient_Care/Specialty_Care/Gastroenterology/Tests___Preparations/endoscopy/EN_Upper-Endosopy-Procedures-update-6.2020.pdf)
- [Rectal EUS](https://www.bmc.org/sites/default/files/Patient_Care/Specialty_Care/Gastroenterology/Tests___Preparations/endoscopy/EN-Flex-sig-and-Rectal-EUS-Fleet-Enema-prep-updated-6.2020.pdf)