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An abscess is a sac of pus. A dental abscess forms when a tooth or the tissue around it becomes infected with bacteria. Read on to learn more.

A contrast echocardiogram helps your health care provider see how your heart is working. It uses ultrasound and a contrast fluid to help highlight the structures in the heart.

There are 2 types of angina, stable and unstable. Stable angina occurs at certain times and can often be managed. Unstable angina occurs at uncertain times. It may not get better with the usual forms of treatment for angina. It is a warning that a heart attack (acute myocardial infarction) is possible in the near future.

Bariatric surgery is a procedure that helps you lose weight. In vertical sleeve gastrectomy, about 80% of the stomach is removed.

This topic tells what an endoscopic ultrasound (IUS) test is, how it's done, and what to expect from it.

The duodenum is the first part of the small intestine. It's just past the stomach. Duodenitis is inflammation of the lining of the duodenum. This sheet tells you more about this health problem.

An esophageal ulcer is an open sore in the lining of your esophagus. The esophagus is the tube that carries food and liquid from your mouth to your stomach. Here's what you need to know about this condition.

The sphincter of Oddi is part of your digestive system. A sphincter is a circle of muscle. The sphincter of Oddi surrounds the end of the tubes (ducts) that connect the gallbladder, liver, and pancreas to the first part of the small intestine (duodenum). The sphincter opens to let digestive juices flow through the ducts from the gallbladder, liver, and pancreas into the small intestine. To prevent the juices from leaking back into the ducts, the sphincter squeezes shut.

You've been told that you have celiac disease. This means that you are sensitive to a protein called gluten. Gluten is found in certain grains. When you ingest gluten, your immune system causes harm to your small intestines. The treatment for celiac disease is to stay away from foods and products that contain gluten. This sheet gives you the basics about a gluten-free diet.