Endoscopic Ultrasound (EUS)
Endoscopic ultrasound (EUS) combines a flexible endoscope with an ultrasound probe on its tip. Passed through the mouth or back passage, it produces close-up ultrasound pictures of the digestive-tract wall and nearby organs such as the pancreas, bile ducts and lymph nodes, and can take needle samples to diagnose and stage disease.
Medically reviewed by the Florence Healthcare medical team · Last reviewed June 2026
Overview
Endoscopic ultrasound (EUS) is a specialized test that brings the ultrasound probe right up to the area of interest from inside the body. Because only the thin wall of the gut separates the probe from organs such as the pancreas, bile ducts and lymph nodes, EUS produces very detailed images that outside scans cannot always achieve. It is used to look closely at masses and cysts of the pancreas and bile ducts, to assess lumps that sit in or beneath the gut lining (submucosal lesions), and to help stage digestive-tract cancers by showing how deeply they extend and whether nearby nodes look involved.
A slim endoscope with an ultrasound sensor on its tip is passed either through the mouth (to examine the food pipe, stomach, pancreas and bile ducts) or through the back passage (to examine the rectum and surrounding structures). Live ultrasound images appear on a monitor as the doctor examines the wall layer by layer. When a tissue or fluid diagnosis is needed, a fine needle can be passed through the scope under real-time guidance to sample a mass, cyst or lymph node — known as fine-needle aspiration or biopsy (FNA/FNB).
For international patients, a dedicated coordinator arranges the evaluation and provides a written plan and a transparent, itemized cost estimate before you travel. Our gastroenterologists can review your reports and imaging remotely first, so we confirm that EUS is the right step for your case and explain what it involves before you commit to the journey.
Who is a candidate?
- A mass or cyst of the pancreas or bile ducts that needs closer assessment or sampling
- A lump in or beneath the gut lining (submucosal lesion) seen at endoscopy or on a scan
- Staging of a known or suspected digestive-tract cancer to guide treatment
- Enlarged or suspicious lymph nodes near the digestive tract that need to be sampled
- Suspected small bile-duct or pancreatic-duct stones not clearly seen on other scans
- Unexplained findings on CT or MRI that require a detailed, close-up view
What happens
- 1
Assessment
Your specialist reviews your symptoms, blood tests and imaging such as CT or MRI to confirm EUS is appropriate and to plan whether needle samples are likely to be needed.
- 2
Preparation
You fast for several hours beforehand. You are told which medicines to pause, especially blood thinners, and sedation is arranged so you are comfortable and relaxed throughout.
- 3
The procedure
Under sedation, the ultrasound endoscope is passed through the mouth or back passage. The doctor examines the wall and nearby organs on the monitor and, if needed, passes a fine needle through the scope to sample a mass, cyst or lymph node under real-time guidance.
- 4
Recovery & follow-up
You are monitored as the sedation wears off and watched for a short period before going home the same day in most cases. Your team explains the findings, and any samples are sent to the laboratory with results shared with you and your home physician.
Benefits
- Gives very close, detailed images of the pancreas, bile ducts, gut wall and nearby nodes
- Allows needle sampling (FNA/FNB) of masses, cysts and lymph nodes in the same session
- Helps stage digestive-tract cancers by showing depth and nearby node involvement
- Can detect small stones or lesions that other scans may miss
- Minimally invasive, usually done through the mouth with no external incisions
Risks & considerations
- The usual risks of sedation, which the team monitors closely throughout
- A mildly sore throat or some bloating from the air used, settling within a day
- Bleeding, which is uncommon and more likely when a needle sample is taken
- Infection, particularly after sampling a cyst, sometimes needing antibiotics
- Rarely, pancreatitis after sampling near the pancreas, or a small tear (perforation) of the gut wall
Conditions this treats
Where it is performed
This procedure is delivered by our Gastroenterology.
Learn more before you decide
Provider-reviewed guides on the related conditions, symptoms and tests in our Health Library.
Endoscopic Ultrasound (EUS) — frequently asked questions
Because the ultrasound probe sits just millimeters from the area of interest, EUS gives a much closer, more detailed view of the pancreas, bile ducts, gut wall and nearby lymph nodes than scans taken from outside the body, and it can guide a needle to take samples at the same time.
EUS is done under sedation, so you are relaxed and comfortable and usually remember little of it. Occasionally general anesthesia is used. Your team explains which is planned for you beforehand.
Often, yes. If a mass, cyst or lymph node needs a tissue or fluid diagnosis, a fine needle can be passed through the scope under real-time ultrasound guidance to sample it (FNA/FNB). Whether this is needed is planned in advance and confirmed during the procedure.
EUS is mainly a detailed imaging and sampling test — it looks closely at the wall and nearby organs and can take needle samples. ERCP is chiefly a treatment procedure that uses dye and X-ray to clear stones, relieve blockages and place stents in the ducts. The two are sometimes used together in planning care.
EUS is usually a day-case procedure, and your coordinator confirms the timeline for your case. We provide a transparent, itemized estimate after reviewing your case and do not quote fixed prices online because each plan is individual.
Related treatments
Considering endoscopic ultrasound (eus)?
Share your reports for a medical second opinion and a transparent, itemized cost estimate — usually within 48 hours.