In partial anomalous pulmonary venous return, some of the pulmonary veins incorrectly send blood to the heart's upper right chamber. That chamber is called the right atrium. Usually, oxygen-rich blood flows from the pulmonary veins to the upper left heart chamber, as shown on the left.
Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press.
Your GivingTuesday gift can go 2X as far.