DiGeorge syndrome is a rare genetic disease. It is present at birth. People with complete DiGeorge syndrome have no thymus or parathyroid glands. The thymus plays an important role in the immune system. The parathyroid glands help control calcium in the blood and body.

Thyroid and Parathyroid Glands
thyroid gland small image Thyroid parathyroid gland (small image)
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DiGeorge syndrome is caused by a deletion of several genes. The lost genetic material controls the development of the thymus and related glands.