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    Noonan syndrome

    Noonan syndrome is a disease that can be passed down through families (inherited). Itcauses abnormal development in many parts of the body. Noonan syndrome used to be called Turner-like syndrome.


    Noonan syndrome is linked to defects in several genes. Problems with the genes cause certain proteins involved in growth and development to become overactive.

    Noonan syndrome is an autosomal dominant condition. This means only one parent has to pass down the faulty gene for the baby to have the syndrome. However, some cases may not be inherited.


    • Delayed puberty
    • Down-slanting or wide-set eyes
    • Hearing loss (varies)
    • Low-set or abnormally shaped ears
    • Mildintellectual disability(only in about 25% of cases)
    • Sagging eyelids (ptosis)
    • Short stature
    • Small penis
    • Undescended testicles
    • Unusual chest shape (usually a sunken chest called pectus excavatum)
    • Webbed and short-appearing neck

    Exams and Tests

    The health care provider will perform a physical exam. This may show signs of congenital heart disease (especially pulmonary stenosis, occasionally ASD).

    Tests depend on the symptoms, but may include:

    • Platelet count
    • Blood clotting factor test
    • EKG, chest x-ray, or echocardiogram
    • Hearing tests

    Genetic testing can help diagnose this syndrome.


    There is no specific treatment. Your doctor will suggest treatment to relieve or manage symptoms. Growth hormone has been used successfully to treat short stature in some persons with Noonan syndrome.

    Support Groups

    The Noonan Syndrome Support Group, Inc. --

    Possible Complications

    • Buildup of fluid in tissues of body (lymphedema, cystic hygroma)
    • Failure to thrive in infants
    • Low self-esteem
    • Male infertility in those with both testes undescended
    • Problems with the structure of the heart
    • Short stature
    • Social difficulties related to physical symptoms

    When to Contact a Medical Professional

    This condition may be detected on early infant exams. Evaluation by an experienced geneticist is often needed to diagnose Noonan syndrome.


    Couples with a family history of Noonan syndrome may want to consider genetic counseling before having children.


    Rapaport R. Hypofunction of the ovaries. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 18th ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 587.


    • Pectus excavatum


      • Pectus excavatum


      A Closer Look

        Self Care

          Tests for Noonan syndrome

            Review Date: 4/16/2012

            Reviewed By: A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, and David R. Eltz. Previously reviewed by Chad Haldeman-Englert, MD, Wake Forest University School of Medicine, Department of Pediatrics, Section on Medical Genetics, Winston-Salem, NC. Review provided by VeriMed Healthcare Network (8/4/2011).

            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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            St. Luke's Hospital - 232 South Woods Mill Road - Chesterfield, MO 63017 Main Number: 314-434-1500 Emergency Dept: 314-205-6990 Patient Billing: 888-924-9200
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