About Your Endoscopic Ultrasound (EUS)

This information explains your endoscopic ultrasound (EUS) at Memorial Sloan Kettering (MSK).

An EUS is a procedure that uses sound waves to produce images of your internal organs. It will give your doctor information about:

  • How deep a tumor extends into your tissue.
  • If your lymph nodes are enlarged.
  • If there is a tumor in nearby tissues.
  • How a tumor has responded to cancer treatment.

During your EUS, your doctor may also take a sample of tissue (biopsy) with a needle. If you have cysts, your doctor can also use a needle to remove fluid from them to see what is causing them to grow.

Your EUS will be done as part of another endoscopy procedure you’re having. To prepare for your EUS, review the information that your nurse gave you about the endoscopy procedure you’re having.

If you have any questions about your EUS, speak with your doctor or nurse.

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