Medical Definition of TAR syndrome

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Reviewed on 12/27/2018

TAR syndrome: Thrombocytopenia absent radius syndrome, in which the platelets needed for blood to clot normally are too few in number and the radius (the smaller of the two bones of the forearm) is absent, resulting in phocomelia (a 'flipper' limb). The fibula (the smaller bone in the lower leg) is also often absent. The risk of bleeding due to having too few platelets is high in early infancy. In the survivors, the platelet problem lessens with age. TAR syndrome is inherited in an autosomal recessive manner. Also known as tetraphocomelia'
thrombocytopenia syndrome.

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Reviewed on 12/27/2018