Arteriovenous Malformations enparentshttps://kidshealth.org/EN/images/headers/Arteriovenous_Malformations_enHD_2.jpgAn arteriovenous malformation (AVM) is an abnormal connection between an artery and a vein. Large AVMs or multiple AVMs usually needs medical treatment.arteriovenous malformation, arteriovenous malformations, arteriovenous, malformations, veins, birthmarks, birth marks, hemangiomas, venous, circulation capillaries, intracranial AVMs, radiology, radiologists, interventional radiologist, sclerotherapy, embolization, blood vessels, angiogram, Cobb syndrome, hereditary hemorrhagic telangiectasia, Parkes Weber syndrome, Wyburn-Mason syndrome, Bonnet-Dechaume-Blanc syndrome, AVMs of the retina, AVMs in the head, AVMs in the skull, vascular anomaly, vascular malformations07/27/201710/08/201809/02/2019Annie Kyoung Lim, DO11/14/2017df73e390-8d76-402e-9219-8f43f8a7fdb9https://kidshealth.org/ws/RadyChildrens/en/parents/arteriovenous-malformations.html/<h3>What Is an Arteriovenous Malformation (AVM)?</h3> <p>An arteriovenous malformation (AVM) is an abnormal connection between an artery (a blood vessel carrying <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/blood.html/">blood</a> from the heart out to the body) and a vein (a vessel returning blood to the heart).</p> <p>It's a shortcut that lets blood flow from an artery to a vein without passing through tiny vessels called capillaries. That's important because oxygen and other nutrients can only pass from the blood into the body parts that need them in capillaries.</p> <p>Blood that takes a shortcut through an AVM returns oxygen-rich blood to <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/heart.html/">the heart</a> instead of delivering it to the body where it's needed. That means some of the heart's work is wasted, so the heart has to work harder than usual. Large AVMs or multiple AVMs can waste so much of the heart's work that it cannot keep up.</p> <p><img class="left" title="" src="https://kidshealth.org/EN/images/illustrations/AVM_414x300_enIL.png" alt="An arteriovenous malformation (AVM) is an abnormal connection between an artery (a blood vessel carrying blood from the heart out to the body) and a vein (a vessel returning blood to the heart)." /></p> <h3>What Are the Signs &amp; Symptoms of an Arteriovenous Malformation (AVM)?</h3> <p>A child with an AVM may have these symptoms:</p> <ul> <li>a pink, red, or purple <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/birthmarks.html/">birthmark</a></li> <li>pain</li> <li>swelling</li> <li>bleeding, which may be difficult to stop</li> <li>warmer skin over the AVM</li> <li>a pulse that's felt around the AVM</li> </ul> <p>Many AVMs, especially those in the head, are not recognized until adulthood. AVMs in the head may cause:</p> <ul> <li>headaches</li> <li>trouble with body movements or speech</li> <li>loss of strength or sensation</li> <li><a href="https://kidshealth.org/ws/RadyChildrens/en/parents/seizure.html/">seizures</a></li> <li>vision problems</li> <li>confusion</li> <li>loss of the ability to understand speech</li> </ul> <p>Bleeding from an AVM can be hard to stop. Frequent bleeding may lead to <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/anemia.html/">anemia</a>. Even small amounts of bleeding from an AVM inside the skull can be very dangerous. AVMs may grow larger and cause trouble by pressing on other parts of the body.</p> <h3>What Causes Arteriovenous Malformations (AVMs)?</h3> <p>Arteriovenous malformations and <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/venous-malformations.html/"><strong>venous malformations</strong></a> are types of <strong>vascular malformations</strong> (also called vascular anomalies). These are problems that happen when blood vessels (capillaries, arteries, veins, or lymphatic vessels) don't develop as they should.</p> <p>Doctors don't know what causes AVMs. Kids who have them are born with them, and an AVM might get larger as the child grows.</p> <p>AVMs can happen with some genetic syndromes, including:</p> <ul> <li><strong>Cobb syndrome:</strong> wine-colored birthmarks with AVMs in the spinal cord</li> <li><strong>hereditary hemorrhagic telangiectasia (HHT):</strong> AVMs in the lungs, brain, and digestive tract</li> <li><strong>Parkes Weber syndrome:</strong> multiple AVMs in one arm or leg; the affected arm or leg typically grows longer and larger than the same limb on the other side</li> <li><strong>Wyburn-Mason syndrome</strong>&nbsp;(also known as Bonnet-Dechaume-Blanc syndrome): AVMs of the retina (the light-sensitive area in the back of the eye) and brain, sometimes involving part of the face</li> </ul> <h3>How Is an Arteriovenous Malformation (AVM) Diagnosed?</h3> <p>An AVM is often found during an exam because a pulse may be felt in its vessels. Then, other tools may be used to learn more about it and plan treatment, such as:&nbsp;</p> <ul> <li>an <strong>ultrasound</strong>, to determine how much blood is flowing through the AVM</li> <li>a CT scan or <strong>MRI</strong>, to see the AVM's size and how close it is to normal body parts</li> <li>an <strong>angiogram</strong>, to map of the AVM's blood vessels, which will help doctors plan how to block blood flow to it</li> <li>an <strong>MRA</strong>, or MRA angiogram, which combines the MRI and angiogram techniques to map the AVM without using X-rays. Similarly, a CT angiogram can be performed.</li> <li>a <strong>standard angiogram</strong>, which shows the arteries by putting dye into a long thin tube (catheter) in the vessel while taking an X-ray</li> </ul> <h3>How Is an Arteriovenous Malformation (AVM) Treated?</h3> <p>The right treatment for an AVM depends on its location, size, and how it affects the child.</p> <h4>Why treat an AVM?</h4> <p>When a child's heart must work harder than usual because of an AVM, prompt treatment is important to prevent permanent changes. An AVM also might be treated to improve pain, bleeding, or its appearance.</p> <p>AVMs in the arms, legs, and body are easier to treat than AVMs in the head.</p> <p>AVMs outside of the skull are treated with:</p> <ul> <li><strong><a href="https://kidshealth.org/ws/RadyChildrens/en/parents/embolization.html/">embolization</a>:</strong> using catheter-guided tools to permanently block the arteries leading to the AVM</li> <li><strong><a href="https://kidshealth.org/ws/RadyChildrens/en/parents/sclerotherapy.html/">sclerotherapy</a>:</strong> injection of a chemical into an AVM that shrinks the blood vessels</li> <li><strong>surgery</strong></li> </ul> <p>AVMs in the head are called <strong>intracranial AVMs</strong> and may be treated with embolization, surgery using <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/radiation.html/">radiation</a> (radiosurgery), or surgery.</p> <p>Embolization and sclerotherapy usually are done by <strong>interventional radiologists</strong> (doctors who specialize in <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/endoscopic.html/">minimally invasive</a>, targeted treatments).</p> <h3>Looking Ahead</h3> <p>Treatment for an AVM depends on its location, size and the symptoms it causes. A small AVM that's not in the head may never need treatment, but it could change as a child grows. Some AVMs get bigger, so it's important to track its size and its effects on a child's health and activities.</p>
BirthmarksBirthmarks that babies are born with, or develop soon after birth, are mostly harmless and many even go away on their own, but sometimes they're associated with certain health problems.https://kidshealth.org/ws/RadyChildrens/en/parents/birthmarks.html/b901b39b-66e0-41a8-b6fa-83721cc48727
CLOVES SyndromeCLOVES syndrome is a very rare genetic disorder that causes vascular, skin, spinal, and bone or joint abnormalities.https://kidshealth.org/ws/RadyChildrens/en/parents/cloves-syndrome.html/0bfa9c17-b66f-4268-94cd-5b5f29fd7e88
EmbolizationEmbolization is a procedure in which plugging material or a plugging object is put into a blood vessel to block it. It's used to help treat many conditions.https://kidshealth.org/ws/RadyChildrens/en/parents/embolization.html/60430803-a6ec-4663-8738-99ca92208556
HemangiomasA hemangioma is a growth of tangled blood vessels. Most hemangiomas grow larger for several months, then shrink slowly. Some will require treatment.https://kidshealth.org/ws/RadyChildrens/en/parents/hemangiomas.html/70accfce-1b1a-4220-9fee-c82f4601c69a
Hemangiomas: Suzanne's StoryWhen Anna was born, she developed red spots that her parents learned were hemangiomas, benign birthmarks that she eventually outgrew. Her mother tells her story.https://kidshealth.org/ws/RadyChildrens/en/parents/hemangiomas-story.html/69a7f1b7-2007-4e63-8e9c-a5dd221a3412
Neurocutaneous SyndromesNeurocutaneous syndromes are genetic disorders that lead to tumor growth in various parts of the body. Learn how to maximize the quality of life for children with these diseases.https://kidshealth.org/ws/RadyChildrens/en/parents/neurocutaneous.html/7e9e3b3a-59da-4998-8655-57927110240f
Neurofibromatosis Type 1Neurofibromatosis type 1 (NF1) is a genetic condition that causes benign tumors in and under the skin, often with bone, hormone, and other problems. Learn more about how it's diagnosed and treated.https://kidshealth.org/ws/RadyChildrens/en/parents/nf.html/433de099-c8cd-4cf0-b6dc-3734a70c9d45
Port-Wine StainsFor most kids, these birthmarks are no big deal — they're just part of who they are. Read about port-wine stains, how to care for them, and, if necessary, what treatments are available.https://kidshealth.org/ws/RadyChildrens/en/parents/port-wine-stains.html/9573f8e2-b366-4cfa-945a-c5e97e0a3b74
SclerotherapySclerotherapy is a procedure in which medicine is injected into blood vessels or lymph vessels to make them close. It's used to treat vascular malformations.https://kidshealth.org/ws/RadyChildrens/en/parents/sclerotherapy.html/93061ebf-ebf3-4024-a3ae-3e39b43ad2e2
Venous Malformations A venous malformation (VM) is a place in the body where veins haven't grown the right way. VMs can be difficult to treat.https://kidshealth.org/ws/RadyChildrens/en/parents/venous-malformations.html/8d09d5c3-704c-4815-ab68-0161ee369be5
What Are Varicose Veins?Do you know an older person whose legs look like a road map with all those blue and purple squiggly lines? They're probably varicose veins.https://kidshealth.org/ws/RadyChildrens/en/kids/varicose-veins.html/1f02523d-b84b-4545-b43e-942e577a95a9
What's a Birthmark?Birthmarks, also known as hemangiomas, get their name for one reason: They are marks on the skin of a lot of newborn babies! Find out more about birthmarks in this article for kids.https://kidshealth.org/ws/RadyChildrens/en/kids/birthmark.html/fc06de92-ad49-4647-a8a1-48bca99cb9b7
Word! Arteries and VeinsYour body has a highway system all its own that sends blood to and from your body parts.https://kidshealth.org/ws/RadyChildrens/en/kids/word-arteries.html/8d284b96-f7d8-48da-bfcb-b00705771ef8
Word! HemangiomaThis is a big word for a type of birthmark.https://kidshealth.org/ws/RadyChildrens/en/kids/word-hemangioma.html/3708f0e4-2c06-4979-af40-992cdb4469de
kh:age-allAgesOrAgeAgnostickh:clinicalDesignation-generalPediatricskh:genre-articlekh:primaryClinicalDesignation-radiologyAndMedicalImagingHeart & Blood Vesselshttps://kidshealth.org/ws/RadyChildrens/en/parents/medical/heart/e9ef0549-4392-4778-974d-753019ce4b8bhttps://kidshealth.org/EN/images/illustrations/AVM_414x300_enIL.png