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    Ataxia - telangiectasia

    Louis-Bar syndrome

    Ataxia-telangiectasia is a rare childhood disease that affects the brain and other parts of the body.

    Ataxia refers to uncoordinated movements, such as walking. Telangiectasias are enlarged blood vessels (capillaries) just below the surface of the skin. Telangiectasias appear as tiny, red, spider-like veins.


    Ataxia-telangiectasia is inherited, which means it is passed down through families. It is an autosomal recessive trait. This means that both parents must provide a defective gene for the child to have symptoms of the disorder.

    The disease results from defects in the ataxia telangiectasia mutated (ATM) gene. Defects in this gene can lead to abnormal cell death in various places of the body, including the part of the brain that helps coordinate movement.

    Boys and girls are equally affected.


    • Decreased coordination of movements (ataxia) in late childhood thatcan include ataxic gait (cerebellar ataxia), jerky gait, unsteadiness
    • Decreasing mental development, slows or stops after age 10 - 12
    • Delayed walking
    • Discoloration of skin areas exposed to sunlight
    • Discoloration of skin (coffee-with-milk-colored spots)
    • Enlarged blood vessels in skin of nose, ears, and inside of the elbow and knee
    • Enlarged blood vessels in the whites of the eyes
    • Jerky or abnormal eye movements (nystagmus) late in the disease
    • Premature graying of the hair
    • Seizures
    • Sensitivity to radiation, including medical x-rays
    • Severe respiratory infections that keep coming back (recurring)

    Exams and Tests

    The doctor will perform a physical exam. Examination may show signs of the following:

    • Below normal sized tonsils, lymph nodes, and spleen
    • Decreased to absent deep tendon reflexes
    • Delayed or absent physical and sexual development
    • Growth failure
    • Mask-like face
    • Multiple skin coloring and texture changes

    Possible tests include:

    • Alpha fetoprotein
    • B and T cell screen
    • Carcinoembryonic antigen
    • Genetic testing to look for mutations in the ATM gene
    • Glucose tolerance test
    • Serum immunoglobulin levels (IgE, IgA)
    • X-rays to look at the size of the thymus gland


    There is no specific treatment for ataxia-telangiectasia. Treatment is directed at specific symptoms.

    Support Groups

    Ataxia Telangiectasia Children's Project -

    National Ataxia Foundation (NAF) -

    Outlook (Prognosis)

    Early death is common, but life expectancy varies.

    Because persons with this condition are very sensitive to radiation, they should never be given radiation therapy, and no unnecessary x-rays should be done.

    • Cancer such as lymphoma
    • Diabetes
    • Kyphosis
    • Progressive movement disorder that leads to wheelchair use
    • Scoliosis
    • Severe, recurrent lung infections

    When to Contact a Medical Professional

    Call your health care provider if your child develops symptoms of this disorder.


    Couples with a family history of this condition who are considering pregnancy may consider genetic counseling.

    Parents of a child with this disorder may have a slight increased risk of cancer. They should have genetic counseling and more intensive cancer screenings.


    Gatti R. Ataxia-Telangiectasia. 1999 Mar 19 [Updated March 11, 2010]. In: Pagon RA, Adam MP, Bird TD, et al., editors. GeneReviews [serial online]. Seattle, Wash: University of Washington, Seattle; 1993-2013. Accessed September 8, 2013.


    • Antibodies


      • Antibodies


      A Closer Look

        Review Date: 9/8/2013

        Reviewed By: Chad Haldeman-Englert, MD, FACMG, Wake Forest School of Medicine, Department of Pediatrics, Section on Medical Genetics, Winston-Salem, NC. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.

        The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

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