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Hydrocele in Children What is a hydrocele in children? A hydrocele is fluid buildup in the thin pouch that holds the testes in the scrotum. Up to 1 in 10 baby boys have a hydrocele at birth. In most cases, it goes away without treatment in the first year. What causes a hydrocele

Common Variable Immunodeficiency in Children What is common variable immunodeficiency in children? Common variable immunodeficiency (CVID) is an immunodeficiency problem that causes a child to have a low level of antibodies and a decreased responsiveness to some vaccines. This

22q11.2 Deletion Syndrome in Children What is 22q11.2 deletion syndrome in children? The 22q11.2 deletion syndrome (22q11.2DS) is a genetic disorder. In children with this syndrome, a tiny piece of chromosome 22 is missing. This can cause many health problems. These problems may

Non-Hodgkin Lymphoma (NHL) in Children What is non-Hodgkin lymphoma (NHL) in children? NHL is cancer that starts in the lymphatic system. The lymphatic system is part of the immune system. It helps to fight diseases and infections. NHL results when the cells in the lymphatic

Mood Disorders in Teens What are mood disorders in teens? Mood disorders are a group of mental health problems. They are sometimes called affective disorders. These are the most common types: Major depression. A teen with this type has a depressed or irritable mood, along with

Endometriosis What is endometriosis? The tissue that lines the uterus is called the endometrium. Normally, if a woman doesn’t get pregnant, this tissue is shed each month during her period. In endometriosis, tissue that looks and acts like endometrial tissue implants outside the

Hepatoblastoma in Children What is hepatoblastoma in children? Hepatoblastoma is a very rare cancer that starts in the liver. It usually affects children less than 3 years of age. About half of all children with it are diagnosed before age 1. It usually doesn’t spread

Stomach and Duodenal Ulcers in Children What is a stomach or duodenal ulcer in children? An ulcer is an open sore (lesion). It’s normally found on the skin or mucous membranes. A peptic ulcer is in the lining of the stomach or the first part of the small intestine (the duodenum)

Lyme Disease in Children What is Lyme disease in children? Lyme disease is an infection caused by bacteria called Borrelia burgdorferi. The bacteria are spread by tick bites. Lyme disease is a year-round problem, but it peaks during the spring and summer months. It can cause

Ventricular Septal Defect (VSD) What is a ventricular septal defect? A ventricular septal defect (VSD) is a congenital heart defect. This means that your baby is born with it. A VSD is a hole in the wall (septum) that separates the 2 lower chambers of the heart (right and left