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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

Common Benign Lumps What are some common types of benign breast lumps? Noncancer (benign) breast lumps can have many causes. Two of the most common causes of benign single breast lumps are cysts and fibroadenomas. Several other conditions can also appear as lumps. These are fat

Omphalocele What is an omphalocele? An omphalocele is a birth defect. It happens when your baby is forming during pregnancy. In this condition, some of your baby's abdominal organs poke out (protrude) from the belly through the belly button (umbilicus). A clear (translucent)

Genetics and Immune Disorders Your immune system is made up of a large network of cells, tissues, and organs. They work together to fight off infections and other harmful substances. But the immune system doesn't always work the way it should. Some disorders make the immune

Candidiasis in Children What is candidiasis in children? Candidiasis is an infection caused by yeast called Candida. Candida is normally harmless, and is found on the skin, vaginal area, and digestive system. But in some cases, it can overgrow. This can cause a rash, itching, and

Imperforate Anus in Children What is imperforate anus in children? Imperforate anus is a problem that your child is born with. It happens when your child has a blocked or missing anus. The final part of the digestive tract is the rectum. The rectum collects and compacts the solid

X-Linked Agammaglobulinemia in Children What is X-linked agammaglobulinemia in children? X-linked agammaglobulinemia is a rare genetic disease. It causes a weakened immune system. It is also known as Bruton's agammaglobulinemia. X-linked means that the gene that causes this

Granulomatosis with Polyangiitis (GPA) What is granulomatosis with polyangiitis? Granulomatosis with polyangiitis (GPA) is an autoimmune disorder. An autoimmune disorder occurs when the body's immune system attacks and destroys healthy tissue. GPA causes inflammation, swelling

Poison Ivy, Oak, and Sumac Rash What is poison ivy, oak, and sumac rash? Poison ivy, poison oak, and poison sumac are types of American plants. They each grow in different parts of the country. The plants cause allergic contact dermatitis in most people who touch them. The rash

The Thyroid Gland Anatomy of the thyroid gland The thyroid gland is found in the front of the neck. It sits below the voice box (larynx) and on top of the trachea (windpipe). It has a butterfly-like shape. The small, 2-inch gland consists of 2 lobes, 1 on each side of the