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</div><div><span>Magnetic resonance angiography</span></div></div>
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<article><div id="d-article"><div class="page-info"><div class="page-title"><a name="start" id="start">
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</a><h1 class="with-also" itemprop="name">Magnetic resonance angiography</h1>
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</noscript></div><div class="main"><div id="ency_summary"><p>Magnetic resonance angiography (MRA) is an <a test="test" href="./003335.htm">MRI</a> exam of the blood vessels. Unlike traditional angiography that involves placing a tube (catheter) into the body, MRA is noninvasive.</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-1"><p>You may be asked to wear a hospital gown. You can also wear clothing without metal fasteners (such as sweatpants and a t-shirt). Certain types of metal can cause blurry images.</p><p>You will lie on a narrow table, which slides into a large tunnel-shaped scanner.</p><p>Some exams require a special dye (contrast). Most often, the dye is given before the test through a vein (IV) in your hand or forearm. The dye helps the radiologist see certain areas more clearly.</p><p>During the MRI, the person who operates the machine will watch you from another room. The test may take 1 hour or more.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How to Prepare for the Test</h2></div><div class="section-button"><button type="submit" aria-controls="section-2" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-2"><p>You may be asked not to eat or drink anything for 4 to 6 hours before the scan.</p><p>Tell your health care provider if you are afraid of close spaces (have claustrophobia). You may be given a medicine to help you feel sleepy and less anxious. Your provider may suggest an "open" MRI. In an open MRI, the machine is not as close to the body.</p><p>Before the test, tell your provider if you have:</p><ul><li>Brain aneurysm clips</li><li>Artificial heart valve</li><li><a test="test" href="./007370.htm">Heart defibrillator</a> or pacemaker</li><li>Inner ear (cochlear) implants</li><li>Insulin pump or chemotherapy port</li><li>Intrauterine device (IUD)</li><li>Kidney disease or dialysis (you may not be able to receive contrast)</li><li>Neurostimulator</li><li>Recently placed artificial joints</li><li>Vascular <a test="test" href="./002303.htm">stent</a></li><li>Worked with sheet metal in the past (you may need tests to check for tiny metal pieces in your eyes)</li></ul><p>Because the MRI contains strong magnets, metal objects are not allowed into the room with the MRI scanner. Avoid carrying items such as:</p><ul><li>Pocketknives, pens, and eyeglasses</li><li>Watches, credit cards, jewelry, and hearing aids</li><li>Hairpins, metal zippers, pins, and similar items</li><li>Removable dental implants</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test will Feel</h2></div><div class="section-button"><button type="submit" aria-controls="section-3" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-3"><p>An MRA exam causes no pain. If you have problems lying still or are very nervous, you may be given a medicine (sedative) to relax you. Moving too much can blur images and cause errors.</p><p>The table may be hard or cold, but you can ask for a blanket or pillow. The machine produces loud thumping and humming noises when turned on. You can wear ear plugs to help reduce the noise.</p><p>An intercom in the room allows you to speak to someone at any time. Some scanners have televisions and special headphones that you can use to help the time pass.</p><p>There is no recovery time, unless you were given a medicine to relax.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Why the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-4" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-4"><p>MRA is used to look at the blood vessels in all parts of the body. The test may be done of the head, heart, abdomen, lungs, kidneys, and legs.</p><p>It may be used to diagnose or evaluate conditions such as:</p><ul><li><a test="test" href="./000162.htm">Arterial aneurysm</a> (an abnormal widening or ballooning of a part of an artery due to weakness in the wall of the blood vessel)
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</li><li><a test="test" href="./000191.htm">Aortic coarctation</a></li><li><a test="test" href="./000181.htm">Aortic dissection</a></li><li><a test="test" href="./000726.htm">Stroke</a></li><li><a test="test" href="./007427.htm">Carotid artery disease</a></li><li><a test="test" href="./000171.htm">Atherosclerosis</a> of the arms or legs
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</li><li>
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Heart disease, including congenital heart disease
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</li><li><a test="test" href="./001156.htm">Mesenteric artery ischemia</a></li><li>
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Renal artery stenosis (narrowing of the blood vessels in the kidneys)
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</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Normal Results</h2></div><div class="section-button"><button type="submit" aria-controls="section-5" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-5"><p>A normal result means the blood vessels do not show any signs of narrowing or blockage.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>What Abnormal Results Mean</h2></div><div class="section-button"><button type="submit" aria-controls="section-6" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-6"><p>An abnormal result suggests a problem with one or more blood vessels. This may suggest:</p><ul><li><a test="test" href="./000171.htm">Atherosclerosis</a></li><li>Trauma</li><li>Congenital disease</li><li>Other vascular condition</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Risks</h2></div><div class="section-button"><button type="submit" aria-controls="section-7" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-7"><p>MRA is generally safe. It uses no radiation. To date, no side effects from the magnetic fields and radio waves have been reported.</p><p>The most common type of contrast used contains gadolinium. It is very safe. Allergic reactions to the substance rarely occur. However, gadolinium can be harmful to people with kidney problems who require dialysis. If you have kidney problems, please tell your provider before the test.</p><p>The strong magnetic fields created during an MRI can cause heart pacemakers and other implants to not work as well. They can also cause a piece of metal inside your body to move or shift.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Alternative Names</h2></div><div class="section-button"><button type="submit" aria-controls="section-Alt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Alt"><p>MRA; Angiography - magnetic resonance</p></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Images</h2></div><div class="section-button"><button type="submit" aria-controls="section-tnails" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/1107t.jpg" alt="MRI scans" title="MRI scans" class="side-img"/><a href="../imagepages/1107.htm">MRI scans</a></li>
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</ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>References</h2></div><div class="section-button"><button type="submit" aria-controls="section-Ref" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Ref"><p>Carpenter JP, Litt H, Gowda M. Magnetic resonance imaging and arteriography. In: Sidawy AN, Perler BA, eds. <em>Rutherford's Vascular Surgery and Endovascular Therapy.</em> 10th ed. Philadelphia, PA: Elsevier; 2023:chap 30.</p><p>Kwong RY. Cardiovascular magnetic resonance imaging. In: Libby P, Bonow RO, Mann DL, Tomaselli GF, Bhatt DL, Solomon SD, eds. <em>Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine.</em> 12th ed. Philadelphia, PA: Elsevier; 2022:chap 19.</p></div></div></section>
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