Angiodysplasia Colonoscopy: Preparation, Procedure and Results

Angiodysplasia colonoscopy is a test used to find fragile, enlarged blood vessels in the large bowel that can cause intermittent bleeding or iron-deficiency anemia. During the same procedure, a gastroenterologist may be able to treat actively bleeding or high-risk lesions using endoscopic techniques.

Angiodysplasia Colonoscopy: What It Shows

An angiodysplasia colonoscopy is performed to look for abnormal, delicate blood vessels in the lining of the large intestine. These vessels, also called vascular ectasias, can leak blood slowly over time or occasionally bleed more noticeably. Colonoscopy is especially useful when a person has unexplained iron-deficiency anemia, blood in the stool, or suspected lower gastrointestinal bleeding.

During the examination, a flexible camera allows the gastroenterologist to inspect the colon directly. Angiodysplasia may appear as a flat or slightly raised red area with fine, branching vessels. If a lesion is thought to be causing bleeding, treatment may be carried out through the colonoscope during the same session.

Not every angiodysplasia finding requires treatment. Some lesions are discovered incidentally in people without bleeding or anemia. In that situation, the specialist considers the whole clinical picture rather than treating the appearance of a blood vessel alone.

How Serious Is Angiodysplasia?

Angiodysplasia is often manageable and is not cancer. Its main clinical concern is bleeding. In some people, small repeated blood losses gradually lower iron stores and lead to anemia, while others may have an episode of visible bleeding that needs prompt medical assessment.

Severity varies widely. A person with no symptoms and stable blood counts may only need observation, whereas recurrent bleeding, dizziness, marked fatigue, or a substantial fall in hemoglobin may require endoscopic treatment and supportive care. The outlook is usually influenced by the frequency of bleeding and by other conditions, such as kidney disease or heart disease.

Bleeding can recur because there may be more than one lesion or because new fragile vessels can develop over time. Follow-up is individualized, and a doctor may recommend repeat blood tests, iron replacement, or additional investigations depending on the cause and course of anemia.

What Disease Is Associated With Angiodysplasia?

Angiodysplasia is more common with increasing age and may be seen more often in people with certain long-term health conditions. It has been associated with chronic kidney disease, cardiovascular disease and disorders that affect blood clotting. Medicines that reduce clotting, including anticoagulants or antiplatelet medicines, can make bleeding from an existing lesion more apparent.

A recognized association exists between intestinal angiodysplasia and aortic stenosis, a narrowing of the aortic heart valve. This combination is sometimes called Heyde syndrome. The relationship is complex, and having angiodysplasia does not mean that a person has aortic stenosis; clinicians consider heart symptoms, examination findings, and medical history when deciding whether cardiac evaluation is appropriate.

Angiodysplasia should also be distinguished from inherited vascular conditions, inflammatory bowel disease, diverticular bleeding, polyps, and colorectal cancer. Colonoscopy and, when needed, laboratory tests or imaging help identify the true source of bleeding.

What Are the Symptoms of Angiodysplasia of the Colon?

Many cases cause no symptoms. When bleeding occurs, it is commonly painless and may be intermittent. A person may notice bright red or maroon blood in the stool, darker stools, or stool that looks unusually black and tar-like. Black stools can also be caused by iron supplements or certain foods and medicines, so medical assessment is important.

Slow blood loss may not be visible. Instead, symptoms can reflect iron-deficiency anemia and include tiredness, reduced exercise tolerance, shortness of breath on exertion, paleness, headaches, or light-headedness. Older adults may describe a gradual loss of energy rather than seeing blood.

Heavy bleeding is less common but can cause weakness, fainting, rapid heartbeat, chest discomfort, or low blood pressure. These symptoms need urgent assessment, particularly in people with heart disease, those taking blood-thinning medicines, or anyone who has had a recent significant change in bowel bleeding.

Why Does Angiodysplasia Occur?

The exact cause of angiodysplasia is not fully understood. It is thought to develop when repeated, brief changes in pressure within the bowel wall affect small veins and capillaries over many years. The vessels can become enlarged, twisted, and closer to the surface of the intestinal lining, making them more prone to bleeding.

These changes are most often found in the right side of the colon, including the cecum and ascending colon. Age-related changes in blood vessels and bowel function may contribute. Angiodysplasia is not caused by a person doing anything wrong, and it is not generally considered preventable in the same way as some lifestyle-related digestive conditions.

Because bleeding can be influenced by medicines and other illnesses, a clinician reviews the full medication list and health history. People should not stop prescribed anticoagulants, aspirin, or antiplatelet medicines on their own; the prescribing clinician and gastroenterologist can advise on the safest plan.

Who May Need an Angiodysplasia Colonoscopy?

A doctor may recommend colonoscopy when there is unexplained iron-deficiency anemia, a positive stool blood test, visible rectal bleeding, or concern about bleeding from the lower gastrointestinal tract. It can also be used after other tests suggest that a colonic vascular lesion may be present.

Before the procedure, the care team reviews symptoms, previous endoscopy findings, blood counts, allergies, heart and lung conditions, kidney function, and medicines. This review is important for people taking anticoagulants, diabetes medicines, or drugs that affect blood pressure. Individual instructions are provided about which medicines to adjust or continue.

Colonoscopy may not identify every bleeding source. Lesions can bleed intermittently, and some vascular abnormalities are located in the small intestine rather than the colon. If bleeding continues despite a nondiagnostic colonoscopy, the specialist may consider upper endoscopy, capsule endoscopy, CT angiography, or other tests based on the urgency and pattern of bleeding.

Angiodysplasia Colonoscopy: Preparation, Procedure and Recovery

Preparation involves clearing stool from the colon so the lining can be seen accurately. Patients usually follow a temporary low-residue or clear-liquid plan and take a prescribed bowel-cleansing solution according to their clinic’s instructions. Good preparation is essential because residual stool can conceal small vascular lesions.

On the day of the procedure, sedation is commonly used to improve comfort. The gastroenterologist gently advances a colonoscope through the rectum and around the colon while examining the lining. Tissue samples are not usually needed to diagnose a typical angiodysplasia, but biopsies may be taken if another abnormality is seen. The examination commonly takes less than an hour, although timing varies when treatment is required.

If treatment is appropriate, the doctor may use argon plasma coagulation, a method that delivers controlled heat to seal fragile vessels. Other endoscopic methods, such as clips or injection therapy, may be selected in particular situations. This is part of colonoscopy-based endoscopic care, and the choice depends on the lesion’s size, location, and whether it is bleeding.

Most people go home the same day after sedation, with a responsible adult available to accompany them. Mild bloating, gas, or brief cramping can occur for several hours. Driving, alcohol, and important decisions should be avoided until the next day or for the period advised by the sedation team. Results may be discussed immediately, while pathology results, if biopsies were taken, usually take longer.

Benefits, Risks and When to Seek Medical Care

The key benefit of colonoscopy is that it can both investigate bleeding and provide treatment without open surgery. It can also assess for other important causes of bleeding, including polyps, inflammation, diverticular disease, or cancer. For symptomatic angiodysplasia, successful endoscopic therapy may reduce or stop blood loss and help anemia improve alongside appropriate iron management.

Colonoscopy is generally safe, but no procedure is risk-free. Possible complications include a reaction to sedation, bleeding after treatment, a tear in the bowel wall, infection, or missed lesions. These events are uncommon, and the team explains relevant risks before consent. Seek urgent medical care after the procedure for severe or worsening abdominal pain, persistent vomiting, fever, fainting, substantial rectal bleeding, or black stools.

Medical care should also be sought promptly for new rectal bleeding, black tar-like stools, fainting, severe weakness, chest pain, or shortness of breath. For non-urgent concerns such as ongoing fatigue or suspected anemia, arranging an appointment with a qualified doctor is appropriate. Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals evaluate and treat gastrointestinal bleeding and related conditions for international patients.

Frequently asked questions

Can angiodysplasia be treated during a colonoscopy?

Yes. If the gastroenterologist identifies a lesion believed to be causing bleeding, treatment can often be delivered through the colonoscope during the same procedure. Argon plasma coagulation is a commonly used option, although the best method depends on the individual lesion and bleeding situation.

Does angiodysplasia mean colon cancer?

No. Angiodysplasia is an abnormality of small blood vessels and is not a cancer. However, bleeding and anemia can have several possible causes, which is why colonoscopy may be used to evaluate the whole colon.

Can angiodysplasia cause iron-deficiency anemia?

Yes. Small, repeated blood losses from fragile bowel vessels can gradually reduce iron stores and cause iron-deficiency anemia. Blood tests can confirm anemia and help clinicians monitor response to treatment.

Will angiodysplasia come back after treatment?

Bleeding may recur after successful treatment, particularly if there are multiple lesions or new lesions develop. Follow-up depends on symptoms, blood counts, the severity of previous bleeding, and other medical conditions.

Should blood-thinning medicines be stopped before colonoscopy?

Some blood-thinning medicines may need adjustment, but this should only be done under the direction of the prescribing clinician and endoscopy team. Stopping these medicines without advice can increase the risk of serious clotting problems.

What happens if colonoscopy does not find the bleeding source?

The clinician may consider whether bleeding is intermittent or coming from another part of the digestive tract, especially the small intestine. Depending on the situation, further testing may include upper endoscopy, capsule endoscopy, specialized imaging, or repeat evaluation.

References

• National Institute of Diabetes and Digestive and Kidney Diseases
• American College of Gastroenterology
• American Society for Gastrointestinal Endoscopy
• National Health Service
• Mayo Clinic

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.