Anomalous Coronary Artery: Causes, Types, Symptoms, Diagnosis & Treatment
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026
TL;DR
An anomalous coronary artery is a congenital heart condition in which a coronary artery did not form in the correct place before birth. Up to 1% of the population has this anomaly, and most cases are not dangerous. However, certain types — especially when the left coronary artery comes from the pulmonary artery (ALCAPA) — can seriously reduce blood flow to the heart muscle. Surgery is often recommended for left-sided anomalies, while many people with right-sided anomalies never need it.
Quick Answer — What is an anomalous coronary artery? • An anomalous coronary artery is a coronary artery that did not form in the correct place before birth, disrupting how blood flows through the heart. • It affects up to 1% of the population, and most cases are not dangerous. • Symptoms vary by type and may include chest pain, fainting, or shortness of breath during physical activity — or no symptoms at all. • Treatment ranges from surgery (six options) to activity limits and medicines, and surgery typically allows return to sports within three months.
What Is an Anomalous Coronary Artery?
An anomalous coronary artery is one that did not form correctly before birth. In many cases, the coronary artery is in the wrong place or comes from the wrong place.
Coronary arteries supply oxygen-rich blood to the heart muscle. Normally, each coronary artery starts at the correct part of the aorta, the body's main artery. When a coronary artery starts somewhere else, the anomaly can disrupt the normal way blood flows through the heart.
The condition can affect the right coronary artery, the left main coronary artery, the left circumflex artery, or the left anterior descending artery.
Answer nugget: An anomalous coronary artery is a coronary artery that did not form in the correct place before birth; it can keep oxygen-rich blood from reaching the heart muscle, and when heart muscle lacks oxygen, tissues can die.
Where Can an Anomalous Coronary Artery Start?
When a coronary artery is in the wrong place, it may start in one of several unusual locations. The most common is the wrong part of the aorta.
Origin location | Description |
Wrong part of the aorta | The most common abnormal origin |
A different coronary artery | The artery branches from part of another coronary artery |
The pulmonary artery | The artery starts from the vessel that should carry blood to the lungs |
Another artery | The artery originates from a different artery entirely |
A key point for reassurance: in some cases, the normal coronary artery can make up for what the abnormal coronary artery cannot do. This compensation is why some people do not develop symptoms until they are adults.
What Are the Types of Anomalous Coronary Artery?
There are four main types of anomalous coronary artery, defined by where the affected artery starts.
Type | What happens |
Absent left main coronary artery | The most common coronary artery anomaly; the left anterior descending and left circumflex arteries connect directly to the left sinus of Valsalva |
Artery from the opposite aortic sinus of Valsalva (AAOCA) | The artery comes out of the sinus on the wrong side — for example, the right coronary artery from the left sinus |
Artery from the pulmonary artery | The coronary artery starts from the pulmonary artery instead of the aorta; can affect the left (ALCAPA) or right (ARCAPA) coronary artery, or rarely both |
Extra artery from the pulmonary artery | A rare form involving an additional artery coming from the pulmonary artery |
What Are the Symptoms of Anomalous Coronary Artery?
Symptoms depend heavily on which type of anomaly is present. Many children with AAOCA have no symptoms at all, and sudden cardiac arrest or sudden cardiac death during exertion may be the first sign — typically between ages 10 and 30.
AAOCA Symptoms
When symptoms of anomalous aortic origin of a coronary artery do occur, they are usually tied to physical activity:
Symptom | When it appears |
Chest pain | With physical activity |
Fainting | During physical activity |
Shortness of breath (dyspnea) | During physical activity |
Heart murmur | Detected on examination |
ARCAPA Symptoms
Symptoms of anomalous origin of the right coronary artery from the pulmonary artery may show up at birth or between ages 40 and 60. They may include angina, shortness of breath, heart failure, heart murmur, and sudden cardiac death.
ALCAPA Symptoms
Symptoms of anomalous origin of the left coronary artery from the pulmonary artery often show up in a baby's first year. Warning signs include signs of pain or irritability, crying while feeding, acute coronary syndrome, heart failure, and heart murmur.
Children or adults with ALCAPA can also experience shortness of breath, abnormal heart rhythm (arrhythmia), heart palpitations, angina, sudden cardiac arrest, heart attack, and heart failure.
Answer nugget: Anomalous aortic origin of a coronary artery (AAOCA) may cause chest pain, fainting, or shortness of breath during physical activity, but many children have no symptoms and sudden cardiac arrest during exertion may be the first sign.
What Causes Anomalous Coronary Artery?
The causes are unknown. An anomalous coronary artery is a congenital (present at birth) problem that happens to a fetus during its first month or so in the uterus, when the coronary arteries are forming.
Researchers have not found evidence that an anomalous coronary artery is hereditary. There is nothing a parent did or did not do during pregnancy that causes this condition.
What Are the Complications?
Anomalous coronary arteries occasionally lead to insufficient blood flow to the heart muscle, which can produce several serious complications:
Complication | Description |
Arrhythmia | An abnormal heart rhythm |
Heart failure | The heart cannot pump blood effectively |
Myocardial ischemia | Not enough blood reaching the heart muscle |
Heart attack | Death of heart muscle tissue |
How Is Anomalous Coronary Artery Diagnosed?
Diagnosis can be difficult because someone with the condition can have a completely normal physical exam, and some people have no symptoms at all.
When the condition is suspected, providers use a range of imaging and cardiac tests to trace where the coronary arteries start and how blood flows through the heart:
Test | What it shows |
Computed tomography (CT) angiogram | Detailed 3D images of the coronary arteries |
Chest X-ray | Overall size and shape of the heart |
Transthoracic echocardiogram | Ultrasound images of the heart's structure and function |
Electrocardiogram (EKG) | The heart's electrical rhythm |
Heart MRI | Detailed images of heart muscle and vessels |
Cardiac catheterization | Direct visualization of the arteries and blood flow |
Stress test | How the heart performs under physical stress |
How Is Anomalous Coronary Artery Treated?
Treatment depends on which coronary artery is affected and whether symptoms are present.
Providers recommend surgery for certain people (with or without symptoms) who have an anomalous origin of the left coronary artery. For anomalous origin of the right coronary artery, surgery is only suggested for some of those with symptoms — most adults with a right-sided anomaly do not need surgery.
Surgical Options
Six surgical approaches are used for anomalous coronary arteries. Many people without symptoms, especially young and healthy ones, choose surgery to prevent possible future problems.
Surgery | How it works |
Artery relocation | Moving the artery and attaching it to the aorta or the correct sinus |
Coronary unroofing | Opening the top of a coronary artery that comes from the wrong sinus |
Pulmonary artery translocation | Moving the pulmonary artery |
Tissue patch | Using a patch of tissue to make part of the anomalous artery larger |
Coronary artery bypass grafting (CABG) | Bypassing the abnormal segment with a graft |
Percutaneous coronary intervention with stent placement | Opening the artery and placing a stent |
Non-Surgical Management
If surgery is not a good option, providers may recommend limiting physical activity — but only if the anomaly puts the child at risk of cardiac arrest. They may also prescribe medicines such as diuretics or beta-blockers to ease the heart's workload.
Children who are low-risk may not need surgery at all and can be as physically active as they want.
Surgical Risks and Recovery
Surgery carries risks, including bleeding, blood clots, injury to a coronary artery, and aortic regurgitation (a leaky aortic valve), along with a small risk of death.
Recovery milestone | What to expect |
Hospital stay | Several days after surgery |
Medication | Aspirin may be needed for three months |
Return to sports | Typically three months after surgery |
What Is the Outlook?
Since an anomalous coronary artery is present at birth, the anatomy will not change without surgery. Children with the condition need regular medical checkups throughout their life, with repeated tests over time.
The outlook varies dramatically by type. For ALCAPA, if a baby does not receive treatment, there is a 90% chance the condition will be fatal. A small number of people with ALCAPA grow into adulthood with or without symptoms. The outlook is good when ALCAPA is treated before problems happen.
For AAOCA, surgery eliminates symptoms and protects the child from sudden death. Limiting physical activity may also prevent sudden death. The level of risk depends on whether the anomalous artery is the right coronary artery or one of the left-sided coronary arteries.
Type | Untreated outlook | With treatment |
ALCAPA | 90% fatal | Good if treated before problems occur |
AAOCA | Risk of sudden death during exertion (often ages 10–30) | Surgery removes symptoms and protects against sudden death |
Right-sided (ARCAPA) | Symptoms may emerge at birth or ages 40–60 | Most adults do not need surgery |
Can Anomalous Coronary Artery Be Prevented?
Unfortunately, an anomalous coronary artery cannot be prevented because it is a condition present at birth, formed during the first month of fetal development.
How Should Families Take Care of a Child With This Condition?
If a child is waiting for surgery or surgery is not a good option, the provider may ask parents to limit the child's exercise. Low-risk children may not need surgery and can be fully active.
If a child is at risk for cardiac arrest, families should consider learning CPR and obtaining an automated external defibrillator (AED) for home use. Knowing how to respond to a cardiac arrest can provide peace of mind.
Situation | Action to take |
Baby cries often | Contact the healthcare provider |
Baby is too pale | Contact the healthcare provider |
Baby is breathing too quickly | Contact the healthcare provider |
Adult has chest pain and shortness of breath | Go to the emergency room immediately |
Conclusion
Anomalous coronary artery is a congenital condition in which a coronary artery forms in the wrong place before birth. It affects up to 1% of the population, and most cases are not dangerous — but the rarer left-sided forms, particularly ALCAPA, can be life-threatening without treatment.
The good news is that this condition is highly treatable. Six surgical options exist, most cases can be managed without surgery at all, and children who undergo repair typically return to sports within three months. Lifelong monitoring keeps the condition in check.
Take action today: If your child faints, has chest pain, or becomes short of breath during physical activity — or if your baby is unusually irritable, pale, or breathes rapidly — see a healthcare provider promptly. If an anomalous coronary artery has been diagnosed in your family, ask about the specific type, the best treatment plan, and how often checkups should happen.
Frequently Asked Questions
What is an anomalous coronary artery?
An anomalous coronary artery is a coronary artery that did not form in the correct place before birth. It may start from the wrong part of the aorta, from the pulmonary artery, or from another artery, which can disrupt blood flow to the heart muscle.
How common is an anomalous coronary artery?
It affects up to 1% of the population. Most cases are not dangerous.
What are the symptoms of an anomalous coronary artery?
Symptoms depend on the type. They may include chest pain, fainting, or shortness of breath during physical activity, a heart murmur, or — in babies with ALCAPA — irritability and crying while feeding. Many children, especially with AAOCA, have no symptoms at all.
What causes an anomalous coronary artery?
The exact cause is unknown. It is a congenital condition that develops during the fetus's first month in the uterus as the coronary arteries form. Researchers have found no evidence that it is hereditary.
How is it diagnosed?
Diagnosis relies on imaging and cardiac tests — CT angiogram, chest X-ray, echocardiogram, EKG, heart MRI, cardiac catheterization, and stress test — because a physical exam can be completely normal.
Does everyone with an anomalous coronary artery need surgery?
No. Surgery is recommended for certain people (with or without symptoms) with an anomalous origin of the left coronary artery. For right-sided anomalies, most adults do not need surgery, and low-risk children can often be fully active without surgery.
What is the outlook for ALCAPA?
Untreated ALCAPA has a 90% chance of being fatal. The outlook is good when it is treated before problems develop, and a small number of people even grow into adulthood with or without symptoms.
When can my child return to sports after surgery?
A child may stay in the hospital for several days, may take aspirin for three months, and should typically be able to return to sports activities three months after surgery.
References
Guenther TM, Sherazee EA, Wisneski AD, et al. Anomalous Origin of the Right Coronary Artery From the Pulmonary Artery: A Systematic Review. Ann Thorac Surg. 2020 Sep;110(3):1063-1071. pubmed.ncbi.nlm.nih.gov
Karangelis D, Mylonas KS, Loggos S, et al. Surgical repair of anomalous aortic origin of coronary artery in adults. Asian Cardiovasc Thorac Ann. 2021 Jan;29(1):51-58. pubmed.ncbi.nlm.nih.gov
Molossi S, Doan T, Sachdeva S. Anomalous Coronary Arteries: A State-of-the-Art Approach. Cardiol Clin. 2023 Feb;41(1):51-69. pubmed.ncbi.nlm.nih.gov
Molossi S, Sachdeva S. Anomalous coronary arteries: what is known and what still remains to be learned? Curr Opin Cardiol. 2020 Jan;35(1):42-51. pubmed.ncbi.nlm.nih.gov
Yuan SM. Anomalous origin of coronary artery: taxonomy and clinical implication. Rev Bras Cir Cardiovasc. 2014 Oct-Dec;29(4):622-9. pubmed.ncbi.nlm.nih.gov
Medical Disclaimer: This article is for general informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare provider or cardiologist with any questions you may have about a medical condition. If you experience chest pain or shortness of breath, seek emergency medical care immediately.
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