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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.

The subclavian artery carries blood from your heart to your arms. If an aneurysm forms in this artery, it must be repaired before something serious occurs. This is done using open subclavian aneurysm repair.

Learn what you can expect before, during, and after bunion surgery.

Knee osteotomy is surgery to shift the positioning of the knee. Read this to learn about the surgery and the recovery.

Push enteroscopy is a procedure that uses a long, flexible tube to check your upper small intestine. Learn how to get ready for the procedure, and what to expect.

Bone marrow is the soft, spongy part inside bones. It makes most of the body’s blood cells. Aspiration and biopsy are procedures done to take a sample of bone marrow out of the body to exam. Find out why these procedures are done and how to prepare for them.