What is it?

Truncus arteriosus is a condition where the aorta and the pulmonary artery (the two main arteries that normally exit the heart) are fused into one large vessel.

How common is it?

Truncus arteriosus occurs in less than 1 per 10,000 live births.

How is it managed?

When truncus arteriosus is suspected, further evaluation includes a specialized evaluation of the fetal heart (“fetal echocardiogram”). As truncus arteriosus is frequently associated with other physical abnormalities and genetic syndromes, genetic counseling and testing are recommended. Prenatal consultations with pediatric cardiology, pediatric cardiothoracic surgery, and neonatology specialists are recommended to discuss the prognosis and management after birth. Prenatal care will be managed by a Maternal-Fetal Medicine specialist, an obstetrician with special training and expertise in high-risk pregnancies.


Newborns will be evaluated and cared for by a team involving pediatric cardiology and neonatology specialists. Outcomes vary widely based upon severity of the condition.

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