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Helicobacter Pylori in Children What is H. pylori (Helicobacter pylori) in children? H. pylori is a spiral-shaped germ (bacteria) that infects the stomach. It can damage the tissue in your child’s stomach and the first part of the small intestine (duodenum). This can cause

Langerhans Cell Histiocytosis in Children What is Langerhans cell histiocytosis in children? Langerhans cell histiocytosis is a rare disorder. It occurs when there are very high levels of a type of immune cell called a Langerhans cell. In the past, this disorder was thought to be

Hirschsprung Disease in Children What is Hirschsprung disease in children? Hirschsprung disease is a rare birth defect. It affects the nerve cells in the large intestine. These nerve cells control the muscles that move food and waste, or stool, through the large intestine. The

Hodgkin Lymphoma in Children What is Hodgkin lymphoma in children? Hodgkin lymphoma is also called Hodgkin disease. It's a type of cancer that starts in the lymphatic system. The lymphatic system is part of the immune system. It helps to fight diseases and infections. The

Anatomy and Function of the Heart Valves What are heart valves? The heart has four chambers: two upper chambers (atria) and two lower chambers (ventricles). Blood passes through a valve before leaving each chamber of the heart. The valves prevent the backward flow of blood

Uterine Fibroids What are uterine fibroids? Fibroids are firm, dense tumors made of smooth muscle cells and fibrous connective tissue. They develop in the uterus. About 1 in 5 to 1 in 2 women of reproductive age have fibroids, but not all are diagnosed. Fibroids are very common

Coarctation of the Aorta (COA) in Children What is coarctation of the aorta in children? Coarctation of the aorta (COA) is a heart defect that is present at birth (congenital). It means that the aorta is narrower than it should be. The aorta is the large artery that carries

Ataxia Telangiectasia (A-T) What is ataxia telangiectasia (A-T)? Ataxia telangiectasia is a rare childhood disease that affects the nervous system, immune system, and other body systems. It is an inherited disease. The symptoms of A-T often begin to show up by age 5. How to say

Poison Ivy Rash in Children What is poison ivy rash? Poison ivy rash is an itchy, allergic reaction to poison ivy. Poison ivy is a very common plant in the U.S. It's similar to two other plants called poison oak and poison sumac. The plants cause allergic dermatitis. This means

Blood Donations and Blood Banking What is blood banking? A blood bank is a place where blood is collected and stored before it is used for transfusions. Blood banking takes place in the lab. This is to make sure that donated blood and blood products are safe before they are used