Angiodysplasia of the Colon
(Colonic Angiodysplasia, Arteriovenous Malformations [AVM] of the Colon)
Krisha McCoy, MS
Angiodysplasia of the colon occurs when blood vessels in the colon (large intestine) enlarge. They may become fragile and result in occasional bleeding in the gastrointestinal (GI) tract.
Normal Anatomy of the Intestines
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Angiodysplasia of the colon is caused by dilated connections between veins and capillaries or arteries in the colon.
Risk Factors TOP
Factors that may increase your chance of angiodysplasia of the colon include:
- Increased age
- Heart problems
- History of blood vessel problems or GI tract bleeding
- Kidney problems
A blood disorder called
von Willebrand disease
Symptoms of angiodysplasia of the colon may include:
- Dark, tarry stools
- Bleeding from the rectum
- Shortness of breath
You will be asked about your symptoms and medical history. A physical exam will be done.
Your blood and stool may be tested.
Imaging tests help evaluate internal structures. Some may use contrast material to make them easier to see. Imaging tests may include:
Talk with your doctor about the best treatment plan for you. Treatment may not be necessary, since nearly all of cases of angiodysplasia of the colon stop bleeding on their own. Treatment options include the following:
Your doctor can often treat tissues with heat to seal bleeding blood vessels during a colonoscopy. Rebleeding is common.
The blood supply to the bleeding area can be clotted through angiography.
Medical Therapy TOP
Medications called somatostatin analogs may be used to prevent bleeding in some people.
Surgery to remove the affected area of the colon may sometimes be necessary.
There are no current guidelines to prevent angiodysplasia of the colon.
American Geriatrics Society Foundation for Health in Aging
National Institute of Diabetes and Digestive and Kidney Diseases
Canadian Association of Gastroenterology
Canadian Digestive Health Foundation
Gastrointestinal angiodysplasia. EBSCO DynaMed Plus website. Available at:
Updated July 14, 2015. Accessed March 16, 2018.
6/19/2014 DynaMed Plus Systematic Literature Surveillance
: Jackson CS, Gerson LB. Management of gastrointestinal angiodysplastic lesions (GIADs): A systematic review and meta-analysis. Am J Gastroenterol. 2014;109(4):474-483.
Last reviewed March 2018 by
EBSCO Medical Review Board
James Cornell, MD
Last Updated: 6/19/2014