Endoscopic Ultrasound (EUS) combines endoscopy
and ultrasound in order to obtain images and information
about the digestive tract and the surrounding tissue and
organs. Endoscopy refers to the procedure of inserting a
long flexible tube via the mouth or the rectum to visualize
the digestive tract (for further information, please visit the
Colonoscopy and
Flexible Sigmoidoscopy
articles), whereas ultrasound uses high-frequency sound waves to
produce images of the organs and
structures inside the body such as ovaries, uterus, liver,
gallbladder, pancreas, aorta, etc.
Traditional ultrasound sends sound waves to the organ(s)
and back with a transducer placed on the skin overlying the
organ(s) of interest. images obtained by traditional
ultrasound are not always of high quality. In EUS a
small ultrasound transducer is installed on the tip of the
endoscope. By inserting the endoscope into the upper or the
lower digestive tract one can obtain high quality
ultrasound images of the organs inside the body.
Placing the transducer on the tip of an endoscope allows
the transducer to get close to the organs inside the body.
Because of the proximity of the EUS transducer to
the organ(s) of interest, the images obtained are
frequently more accurate and more detailed than the ones
obtained by traditional ultrasound. The EUS also
can obtain information about the layers of the intestinal
wall as well as adjacent areas such as lymph nodes and the
blood vessels.
Other uses of EUS include studying the flow of
blood inside blood vessels using Doppler ultrasound, and to
obtain tissue samples by passing a special needle, under
ultrasound guidance, into enlarged lymph nodes or
suspicious tumors. The tissue or cells obtained by the
needle can be examined by a pathologist under a microscope.
The process of obtaining tissue with a thin needle is
called fine needle aspiration (FNA).
Abdominal pain is pain in the belly and can be acute or chronic. Causes include inflammation, distention of an organ, and loss of the blood supply to an organ. Abdominal pain can reflect a major problem with one of the organs in the abdomen such as the appendix, gallbladder, large and small intestine, pancreas, liver, colon, duodenum, and spleen.
Lung cancer kills more men and women than any other form of cancer. Eight out of 10 lung cancers are due
to tobacco smoke. Lung cancers are classified as either small cell or non-small
cell cancers.
Gallstones are stones that form when substances in the bile harden. Gallstones (formed in the gallbladder) can be as small as a grain of sand or as large as a golf ball. There can be just one large stone, hundreds of tiny stones, or any combination. The majority of gallstones do not cause symptoms.
Liver cancer is the fifth most common cancer in the world and the majority of patients with liver cancer will die within one year as a result. Patients with associated cirrhosis caused by chronic hepatitis B or C infections, alcohol, and hemochromatosis are at the greatest risk of developing liver cancer. Many patients with liver cancer do not develop symptoms until the advanced stages of the tumor which usually makes prognosis poor. The combination of an imaging study (ultrasound, CT, or MRI scans) and an elevated blood level of alpha-fetoprotein will most effectively diagnose liver cancer, while a liver biopsy can make a definitive diagnosis. Medical treatments, including chemotherapy, chemoembolization, ablation, and proton beam therapy, are not very effective. Surgical removal of the tumor or a liver transplant may be most effective in certain cases.
Pancreatic cancer is a malignant tumor of the pancreas. Pancreatic cancer has been called a "silent" disease because early pancreatic cancer usually does not cause symptoms.
Colon cancer is a malignancy that arises from the inner lining of the colon. Most, if not all, of these cancers develop from colonic polyps. Removal of these precancerous polyps can prevent colon cancer.
Though the cause of stomach cancer is unknown, risk factors for stomach cancer include diet, H. pylori infection, smoking age, gastritis, stomach surgery, family history, and pernicious anemia. Symptoms include stomach discomfort, feeling full after a small meal, nausea and vomiting, and weight loss. Treatment depends upon staging and may involve surgery, radiation therapy, or chemotherapy.
Pancreatitis is a rare disease in which the pancreas becomes inflamed, occurring when digestive enzymes are activated and begin attacking the pancreas causing damage to the gland. There are two types of pancreatitis, acute and chronic. Most commonly caused by alcohol or gallstones, it can lead to bleeding in the gland, serious tissue damage, infection, and cysts. Enzymes and toxins may then enter the bloodstream and seriously injure organs, such as the heart, lungs, and kidney.
Esophageal cancer is a disease in which malignant cells form in the esophagus. Risk factors of cancer of the esophagus include smoking, heavy alcohol use, Barrett's esophagus, being male and being over age 60. Severe weight loss, vomiting, hoarseness, coughing up blood, painful swallowing, and pain in the throat or back are symptoms. Treatment depends upon the size, location and staging of the cancer and the health of the patient.
Gallbladder (gall bladder) pain can be caused by gallbladder disease such as gallstones or cholecystitis. Causes of gallbladder pain can be caused from biliary colic. Biliary colic is pain caused by gallstones trapped in the bile ducts. Cholecystitis is inflammation of the
gallbladder. Symptoms of gallbladder disease include nausea, vomiting, abdominal bloating and belching, sweating, and shortness of breath. Treatment of gallbladder pain depends on the cause.
Digestion is the complex process of turning food you eat into the energy you need to survive. The digestive process also involves creating waste to be eliminated, and is made of a series of muscles that coordinate the movement of food.
While the patient's history and physical examination are the building blocks
of making a medical diagnosis, the ability to peer inside the body can be a
powerful tool. Ultrasound is an imaging technique that provides that
ability to medical practitioners.
What is an ultrasound?
Ultrasound produces sound waves that are beamed into the body causing return
echoes that are recorded to "visualize" structures beneath the skin. The ability
to measure different echoes reflected from a variety of tissues allows a shadow
picture to be constructed. The technology is especially accurate at seeing the
interface between solid and fluid filled spaces. These are actually the same
principles that allow SONAR on boats to see the bottom of the ocean.
What is ultrasonography?
Ultrasonography is body imaging using ultrasound in medical diagnosis. A
skilled ultrasound technician is able to...
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