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PARATHYROIDS, HYPOPLASIA OF THE THYMUSAND
Also known as the digeorge syndrome (dgs), this mess is characterised by (1) lowbloodcalcium levels (hypocalcaemia) due to underdevelopment (hypoplasia) of the parathyroid glands which control calcium; (2) underdevelopment (hypoplasia) of the thymus, an organ behind the breastbone in which lymphocytesmature and multiply; and (3) defects of the heartinclusion the outflow tracts from the heart. most cases of dgs are due to a microdeletion in chromosomeband 22q11.2. A littlenumber of cases have defects in another chromosomes, notably 10p13. Named after the american paediatricendocrinologist angelo digeorge. Other name for dgs is the third and fourth pharyngeal pouch syndrome.