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Copyright 1989, 1996, 2003, 2004, 2007, 2009
NORD is very grateful to R. Michael Scott, MD, Neurosurgeon-in-Chief, The Children's Hospital, Boston, and Edward R. Smith, MD, Department of Neurosurgery, Children's Hospital Boston/Harvard Medical School, for assistance in the preparation of this report.
Synonyms of Moyamoya Syndrome
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 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.
Organizations related to Moyamoya Syndrome
- Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg MD 20898-8126
Phone #: 301-251-4925
800 #: 888-205-2311
e-mail: ordr@od.nih.gov
Home page: http://rarediseases.info.nih.gov/Default.aspx
- 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)
P.O. Box 5801
Bethesda MD 20824
Phone #: 301-496-5751
800 #: 800-352-9424
e-mail: me20t@nih.gov
Home page: http://www.ninds.nih.gov/
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