The interior of the heart is composed of valves, chambers, and associated vessels.

The external structures of the heart include the ventricles, atria, arteries and veins. Arteries carry blood away from the heart while veins carry blood into the heart. The vessels colored blue indicate the transport of blood with relatively low content of oxygen and high content of carbon dioxide. The vessels colored red indicate the transport of blood with relatively high content of oxygen and low content of carbon dioxide.

A myxoma is a benign tumor in the heart most commonly found in the left atrium. About 75% of myxomas are in the left atrium, usually beginning in the wall that divides the lower chambers of the heart (ventricles) and growing into the atrium. Treatment is necessary to avoid metastasis and the formation of clots. In addition, untreated growth of the tumor can obstruct blood flow through the heart. Myxomas are curable with surgical removal.

A myxoma is a benign tumor in the heart. Right atrial myxomas occur less frequently than left atrial myxomas. Treatment is necessary to avoid metastasis and the formation of clots. In addition, untreated growth of the tumor can obstruct blood flow through the heart. Myxomas are curable with surgical removal.