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• A to Z: Torticollis

  Learn about this condition, which affects neck muscles.

• A to Z: Tracheitis

  Learn about tracheitis, a condition that affects the respiratory tract.

• A to Z: Transplant, Bone Marrow

  Learn more about this medical procedure in which damaged stem cells in the blood are replaced with healthy stem cells.

• A to Z: Trisomy 21

  See: Down Syndrome.

• A to Z: Truncus Arteriosus

  In the womb, a child’s heart may develop a single large artery rather than separate aortic and pulmonary arteries. Learn about the condition here.

• A to Z: Tuberous Sclerosis

  Learn about this genetic disorder that causes noncancerous tumors to grow in many parts of the body.