An endoscopic ultrasound in Northern Virginia is ordered when a scan has raised a question that a scan cannot finish answering. A CT or MRI may show a spot on the pancreas, a thickened area in the stomach wall, an enlarged lymph node, or a bulge under the lining that could be almost anything. An endoscopic ultrasound, usually shortened to EUS, gets the ultrasound probe close enough to see those structures in detail from the inside, and it can take a tissue sample in the same session. This page explains what an EUS shows, when it is used, what the day looks like, and what the risks are.
What is an endoscopic ultrasound
An endoscopic ultrasound combines two familiar tools. The first is an endoscope, a thin flexible tube with a camera, like the one used for an upper endoscopy. The second is an ultrasound probe, which sends sound waves into tissue and builds a picture from the echoes. On an EUS scope, the ultrasound probe sits on the tip of the endoscope itself.
That placement is the whole point. An ultrasound done on the skin has to send sound waves through the abdominal wall, fat, and gas-filled bowel before it reaches the pancreas, and the picture degrades along the way. An EUS probe sits in the stomach or the duodenum, separated from the pancreas by a thin wall of tissue, so it produces a much more detailed image of the pancreas, the bile ducts, and the layers of the digestive tract wall than an outside scan can.
The American Society for Gastrointestinal Endoscopy describes EUS as letting a physician examine the lining and the walls of the upper and lower digestive tract, and also study nearby organs including the liver, gallbladder, and pancreas. It sees things that are close by but outside the reach of a standard camera.
Why an endoscopic ultrasound in Northern Virginia is ordered
The most common reason is a question about the pancreas. A pancreatic mass or a pancreatic cyst found incidentally on a scan needs to be characterized, and EUS is the test that shows its size, its borders, its internal structure, and its relationship to nearby blood vessels, with the option of sampling it. Cysts in particular are common and most are harmless, so the goal is often to sort the ones that need watching from the ones that need nothing.
Other situations that lead to an EUS include a suspected stone in the bile duct, where EUS can confirm or rule out a stone before anyone commits to an ERCP; staging of a known esophageal, stomach, rectal, or pancreatic cancer, because the layered view shows how deep a tumor has grown and whether nearby lymph nodes look involved; a subepithelial lesion, meaning a bump under the lining found during a routine scope, where EUS shows which wall layer it comes from; evaluation of chronic pancreatitis or unexplained recurrent pancreatitis; and enlarged lymph nodes or other structures next to the digestive tract that need sampling.
EUS is also used to sample a suspicious area when other approaches are difficult or riskier. Because the needle travels only a short distance from inside the gut, some lesions are far easier to reach this way than through the skin.
What an endoscopic ultrasound shows that other tests do not
It helps to place EUS next to the tests it is often confused with. A CT or MRI sees the whole abdomen and is the right first look, but small pancreatic lesions and the individual layers of the bowel wall sit below what those scans resolve reliably. An upper endoscopy sees the surface of the lining in high detail but cannot see through it. An ERCP enters the bile and pancreatic ducts and can remove a stone or place a stent, but it is a treatment procedure with a meaningfully higher risk profile, so it is generally reserved for cases where something needs to be fixed. MRCP, a form of MRI, images the ducts without a scope but cannot take a sample.
EUS occupies the space between them. It resolves detail the cross-sectional scans miss, it looks beneath the surface rather than at it, and it can obtain tissue, which no imaging test can do. In many pancreatic and biliary evaluations, EUS is the step that determines whether an ERCP or surgery is needed at all.
Tissue sampling during an EUS
When a sample is needed, a thin needle is passed through a channel in the scope and into the target under live ultrasound guidance. When the needle draws out cells, it is called fine needle aspiration, or FNA. When it retrieves a small core of tissue with its architecture intact, it is called fine needle biopsy, or FNB. Which one is used depends on the target and on what the pathologist needs to see.
Sampling adds time to the procedure and it is the part of an EUS that carries most of the added risk, which is why it is done when the answer will change what happens next, not routinely. Results come from a pathologist and generally take several days. Your physician will tell you how you will receive them and who will go over them with you.
Preparing for an endoscopic ultrasound in Northern Virginia
Preparation resembles that for an upper endoscopy. You will be given fasting instructions, generally no food for about eight hours beforehand and no liquids for a defined window before arrival, and following them exactly matters, because sedation on a non-empty stomach carries a risk of aspiration and the procedure will be delayed if the instructions were not followed.
Tell us about every medication and supplement you take, with doses. Blood thinners and antiplatelet medications matter most, because needle sampling has to be planned around them and several of these drugs need adjusting days ahead. Diabetes medications, including the newer GLP-1 agonists, also need review. Report any prior reaction to sedation or anesthesia, sleep apnea and CPAP use, implanted devices, and whether you are or may be pregnant.
Arrange a ride. A responsible adult must take you home, and you should not drive, work, or make important decisions for the rest of the day. If your EUS is for a rectal or lower target rather than an upper one, you will also be given a bowel preparation, similar in principle to the instructions on our colonoscopy prep page.
What happens during and after the procedure
Our physicians perform endoscopic procedures at VHC Health, Inova Fairfax Hospital, and Woodburn Endoscopy Center, and our office will tell you which facility your procedure is scheduled at and what to expect there. You arrive fasting, an intravenous line is placed, and sedation is given. The principles are the same ones described on our page about sedation for endoscopy. Your breathing, heart rate, blood pressure, and oxygen level are monitored throughout.
You usually start out lying on your left side. For an upper EUS the scope goes in through the mouth and down to the stomach and duodenum, and it does not interfere with your breathing. The ASGE notes that the exam generally takes less than 60 minutes, and that many patients do not remember it afterward. Sampling can extend it.
Afterward you wake in a recovery area and are monitored until you are alert and stable. A sore throat, bloating, and grogginess are common in the first hours and settle on their own. Your physician will explain what was seen, and you should expect written instructions as well, since sedation makes spoken instructions hard to retain. Bring your escort into that conversation if you can. Most people eat lightly at first and return to a normal diet the same evening or the next day.
Some symptoms need prompt attention rather than a wait-and-see approach. Call our office, or seek emergency care if symptoms are severe, for abdominal pain that is worsening rather than settling, especially pain that goes through to your back; fever or chills; repeated vomiting; black or tarry stools or vomiting blood; chest pain; or difficulty swallowing or breathing.
Risks of an endoscopic ultrasound
A diagnostic EUS without sampling has a risk profile close to that of a routine upper endoscopy, and adding a needle raises it modestly. The figures below come from the ASGE guideline on adverse events associated with EUS and EUS-guided procedures.
Perforation, a tear in the wall of the digestive tract, is uncommon. A meta-analysis of more than 10,900 patients undergoing EUS with fine needle aspiration found a pooled perforation rate of 0.02 percent, and a population-based study of more than 4,300 patients found an overall rate of 0.05 percent. Bleeding is likewise uncommon and usually minor: the same meta-analysis reported a pooled bleeding rate of 0.13 percent, a figure that includes mild, self-limited bleeding at the sampling site.
Pancreatitis is the complication specific to sampling the pancreas. A meta-analysis of more than 8,200 patients who had fine needle aspiration or biopsy of a pancreatic structure reported a pancreatitis rate of 0.44 percent, and 91.7 percent of those cases were classified as mild or moderate. Two more recent studies reported rates of 0.32 percent and 0.44 percent. Infection is also uncommon, with a pooled rate of 0.4 percent reported after sampling of pancreatic cysts. Sedation carries its own small set of risks, which are the same ones that apply to any endoscopic procedure.
Your own risk is shaped by your anatomy, your other medical conditions, your medications, and what is being sampled. That is a reason to have the conversation before the procedure, not a reason to avoid a test that is going to answer a question that matters.
Schedule an evaluation with GC of NoVA
An endoscopic ultrasound is not a first step. It follows an evaluation and imaging that have raised a specific question, and that path starts with a conversation about your symptoms and history. Our first visit guide explains what that appointment covers, and our pages on chronic abdominal pain and unexplained weight loss cover two of the symptoms that most often begin it. Diego I. Kuperschmit, MD completed an advanced endoscopic fellowship at Beth Israel Medical Center in New York City, where he trained in endoscopic ultrasound and ERCP, and he sees patients with pancreatic and biliary conditions at our practice.
Gastroenterology Center of Northern Virginia sees patients at our Arlington office at 1715 N George Mason Drive, adjacent to VHC Health, and our Annandale office at 3299 Woodburn Road in the Woodburn Medical complex near Inova Fairfax Hospital. Call Arlington at (703) 522-7476 or Annandale at (703) 560-6106, or visit gcofnova.com. Office hours are Monday through Thursday 8:30 a.m. to 5:00 p.m. and Friday 8:30 a.m. to 4:30 p.m.
Frequently asked questions about endoscopic ultrasound
What is an endoscopic ultrasound used for?
It is used to look closely at the pancreas, the bile ducts, and the layers of the digestive tract wall, and at structures such as lymph nodes that sit just outside it. Common reasons include characterizing a pancreatic mass or cyst, checking for a stone in the bile duct, staging a known cancer, and identifying a bump found under the lining during a routine scope. A tissue sample can be taken in the same session.
How long does an endoscopic ultrasound take?
The ASGE notes that the exam generally takes less than 60 minutes, and needle sampling can extend it. Plan on a longer day than the procedure time suggests, since you arrive early for check-in and an intravenous line, and you are monitored in recovery until the sedation wears off. You will not be able to drive afterward, so a responsible adult needs to take you home.
Am I awake during an endoscopic ultrasound?
No. Sedation is given through an intravenous line, and many patients do not remember the procedure afterward. The scope does not interfere with your breathing, and your heart rate, blood pressure, and oxygen level are monitored throughout. Grogginess and a mild sore throat for about a day are common and settle on their own.
What is the difference between an endoscopic ultrasound and an ERCP?
An endoscopic ultrasound images the pancreas, ducts, and surrounding structures from inside the digestive tract and can take a needle sample, but it does not enter the ducts. An ERCP enters the ducts and can remove a stone, open a narrowing, or place a stent, and it carries a higher complication rate. EUS is frequently used first to determine whether an ERCP is needed at all.
What are the risks of an endoscopic ultrasound?
Complications are uncommon. The ASGE reports a pooled perforation rate of 0.02 percent and a pooled bleeding rate of 0.13 percent among more than 10,900 patients who had EUS with fine needle aspiration, with most bleeding mild and self-limited. Pancreatitis after sampling a pancreatic structure was reported at 0.44 percent, and 91.7 percent of those cases were mild or moderate. Sedation carries its own separate risks.
Why do I need an EUS if I already had a CT scan?
A CT scan images the whole abdomen from the outside and is the right first look, but sound waves have to cross the abdominal wall and gas-filled bowel to reach the pancreas, and fine detail is lost. An EUS probe sits inside the stomach or duodenum, only a thin layer of tissue away from the target, so it resolves small lesions and individual bowel wall layers that a CT cannot. It can also take a tissue sample, which no imaging test can do.
This article is for general education and is not medical advice. Whether an endoscopic ultrasound is appropriate for you, and what it would be looking for, depend on your health history, your imaging, and your symptoms. Talk with a qualified gastroenterologist about your symptoms, diagnosis, and treatment options.
