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Aortic stenosis relates to a heart valve that is too narrow or is blocked. The aortic valve is one of four heart valves that keep blood flowing through the heart and keeps blood flowing from the left ventricle to the aorta. Your child may be ...

Lactose intolerance is when the body can’t easily break down or digest lactose. Lactose is a sugar found in milk and milk products. ...

Germ cells form the eggs (ova) in females and the sperm in males. Germ cell tumors are made up of these underdeveloped cells. Germ cell tumors are rare. ...

Parents, stay informed about common winter viruses affecting children. From colds to flu and RSV, know the symptoms and best care practices for your child's health. ...

A food allergy is when your child’s body has a bad immune reaction to a certain food. This is different from a food intolerance which does not affect the immune system. This is true even though some of the same signs may be present. ...

Osteosarcoma is cancer of the bone. The cancer (malignant) cells make immature bone cells (osteoid). Osteosarcoma is very rare, but it is the most common type of bone cancer in children and teens. It is most common in teens and young adults. ...

A birth defect is a health problem or physical change that is present when a baby is born. Birth defects are also called congenital anomalies or congenital abnormalities. The word congenital means present at birth. ...

Non-Hodgkin's Lymphoma (NHL) is a type of cancer in the lymphatic system. The lymphatic system is part of the immune system. It helps to fight diseases and infections. The lymphatic system also helps with balancing fluids in different parts of the body. ...

Encopresis is when your child leaks stool into his or her underwear. It is most often because of long-term (chronic) constipation. Encopresis happens to children ages 4 and older who have already been toilet trained. ...

Neuroblastoma is a cancerous tumor. It grows in nerve tissue of babies and young children. The cancer cells grow in young nerve cells of a baby growing in the womb. These cells are called neuroblasts. It’s is the most common cancer in babies under age ...