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Arteriovenous Malformation

Important
It is possible that the main title of the report Arteriovenous Malformation 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

  • AVM

Disorder Subdivisions

  • arteriovenous malformation of the brain
  • arteriovenous malformation of the spine

General Discussion

Arteriovenous malformation (AVM) is a vascular lesion that is a tangle of vessels of varying sizes in which there is one or more direct connections between the arterial and venous circulations. In the lesion there is no capillary bed, which is part of normal tissue. Brain AVMs are often presumed to be congenital, but there is no direct evidence that they form in utero. The distribution of age at detection for brain AVMs is normally-distributed with the mean age in the mid-30's. Although a small number of AVMs manifest themselves at or shortly after birth, most of them present later in life, and just as likely, form and progress during the later years of life. The lack of capillaries allows blood traveling through the abnormal fistulous connections to flow rapidly. The low resistance of the direct A-V connections, termed fistulas, results in very high flow rates in the vessels leading to and within the AVM. These high flow rates can lower the pressure in the arteries leading to the AVM and to surrounding relatively normal brain tissue. Further, because of the direct A-V connections, the pressure in the arteries, even if somewhat reduced, are transmitted to the veins draining the AVM and surrounding brain, which normally operate at very low pressures. AVM can occur in many different parts of the body, but those located in the central nervous system (brain and spinal cord) can cause problems that affect the brain like other forms of stroke.

Resources

HHT Foundation International, Inc.
P.O. Box 329
Monkton, MD 21111
United States
Tel: (410)357-9932
Fax: (410)357-0655
Tel: (800)448-6389
Email: hhtinfo@hht.org
Internet: http://www.hht.org

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

Vascular Disease Foundation
550 M Ritchie Highway
PMB-281
Severna Park, MD 21146
Tel: (443)261-5564
Tel: (888)833-4463
Email: robert.greenberg@vdf.org
Internet: http://www.vdf.org

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
Internet: http://rarediseases.info.nih.gov/GARD/

National Organization of Vascular Anomalies
PO Box 38216
Greensboro, NC 27438-8216
Email: admin@mail.novanews.org
Internet: http://www.novanews.org

Venous Disease Coalition
1075 S. Yukon Street, Suite 320
Suite 320
Lakewood, CO 80226
Tel: (303)989-0500
Fax: (303)989-0200
Tel: (888)833-4463
Email: info@venousdiseasecoalition.org
Internet: http://www.venousdiseasecoalition.org

For a Complete Report:

This is an abstract of a report from the National Organization for Rare Disorders (NORD). A copy of the complete report can be downloaded free from the NORD website for registered users. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational therapies (if available), and references from medical literature. For a full-text version of this topic, go to www.rarediseases.org and click on Rare Disease Database under "Rare Disease Information".

The information provided in this report is not intended for diagnostic purposes. It is provided for informational purposes only. NORD recommends that affected individuals seek the advice or counsel of their own personal physicians.

It is possible that the title of this topic is not the name you selected. Please check the Synonyms listing to find the alternate name(s) and Disorder Subdivision(s) covered by this report

This disease entry is based upon medical information available through the date at the end of the topic. Since NORD's resources are limited, it is not possible to keep every entry in the Rare Disease Database completely current and accurate. Please check with the agencies listed in the Resources section for the most current information about this disorder.

For additional information and assistance about rare disorders, please contact the National Organization for Rare Disorders at P.O. Box 1968, Danbury, CT 06813-1968; phone (203) 744-0100; web site www.rarediseases.org or email orphan@rarediseases.org

Last Updated:  2/7/2013
Copyright  1986, 1987, 1989, 1992, 1995, 1996, 1998, 1999, 2000, 2004, 2007, 2010, 2013 National Organization for Rare Disorders, Inc.

WebMD Medical Reference from the National Organization of Rare Disorders

Last Updated: September 04, 2014
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

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