Moyamoya Syndrome

National Organization for Rare Disorders, Inc.

Important
It is possible that the main title of the report Moyamoya Syndrome is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.

Synonyms

  • Moya-moya Disease

Disorder Subdivisions

  • None

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 include stroke, which may result 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.

Resources

National Institute of Neurological Disorders and Stroke (NINDS)
P.O. Box 5801
Bethesda, MD 20824
Tel: (301)496-5751
Fax: (301)402-2186
Tel: (800)352-9424
TDD: (301)468-5981
Email: me20t@nih.gov
Internet: http://www.ninds.nih.gov/

MUMS National Parent-to-Parent Network
150 Custer Court
Green Bay, WI 54301-1243
USA
Tel: (920)336-5333
Fax: (920)339-0995
Tel: (877)336-5333
Email: mums@netnet.net
Internet: http://www.netnet.net/mums/

Moyamoya.com
PO Box 9602
Wichita, KS 67277
USA
Email: admin@moyamoya.com
Internet: http://www.moyamoya.com

Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg, MD 20898-8126
Tel: (301)251-4925
Fax: (301)251-4911
Tel: (888)205-2311
TDD: (888)205-3223
Email: ordr@od.nih.gov
Internet: http://rarediseases.info.nih.gov/Default.aspx

Madisons Foundation
PO Box 241956
Los Angeles, CA 90024
Tel: (310)264-0826
Fax: (310)264-4766
Email: getinfo@madisonsfoundation.org
Internet: http://www.madisonsfoundation.org

For a Complete Report

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

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