Diseases & Conditions


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Moyamoya Syndrome


Synonyms of Moyamoya Syndrome
  • Moya-moya Disease

Disorder Subdivisions



    General Discussion
    Moyamoya syndrome is a progressive disorder that affects the blood vessels in the brain (cerebrovascular). It is characterized by the narrowing (stenosis) and/or closing (occlusion)inside the skull of the carotid artery, the major artery that delivers blood to the brain. At the same time, tiny blood vessels at the base of the brain open up in an apparent attempt to supply blood to the brain distal to the blockage; these tiny vessels are the moyamoya vessels, for which the disease was named. Inadequate blood supply leads to reduced oxygen to the brain, and it is this oxygen deprivation that causes the signs of Moyamoya -- which typically stroke, wich may results in paralysis of the face, arms or legs, loss of speech, etc., or temporary loss of neurologic function of body parts or speech (transient ischemic attacks). Other symptoms that may result include headaches, various vision problems, developmental delay, seizure disorders, and visual problems.

    Approximately 10% of cases of Moyamoya in Asian countries are due to a genetic cause and are termed primary Moyamoya disease. Secondary Moyamoya syndrome refers to cases in which the artery changes occur as a consequence or result of another underlying disorder.

    Organizations related to Moyamoya Syndrome
    • MUMS (Mothers United for Moral Support, Inc) National Parent-to-Parent Network
      150 Custer Court
      Green Bay WI 54301-1243
      Phone #: 920-336-5333
      800 #: 877-336-5333
      e-mail: mums@netnet.net
      Home page: http://www.netnet.net/mums/
    • Madisons Foundation
      PO Box 241956
      Los Angeles CA 90024
      Phone #: 310-264-0826
      800 #: N/A
      e-mail: getinfo@madisonsfoundation.org
      Home page: http://www.madisonsfoundation.org
    • Moyamoya.com
      PO Box 9602
      Wichita KS 67277
      Phone #: N/A
      800 #: N/A
      e-mail: admin@moyamoya.com
      Home page: http://www.moyamoya.com
    • National Institute of Neurological Disorders and Stroke (NINDS)
      31 Center Drive
      Bethesda MD 20892-2540
      Phone #: 301-496-5751
      800 #: 800-352-9424
      e-mail: braininfo@ninds.nih.gov
      Home page: http://www.ninds.nih.gov/



    For a Complete Report

    This is an abstract of a report from the National Organization for Rare Disorders, Inc. ? (NORD). A copy of the complete report can be obtained for a small fee by visiting the NORD website. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational treatments (if available), and references from medical literature. For a full-text version of this topic, see http://www.rarediseases.org/search/rdblist.html