An atrial myxoma is a noncancerous tumor in the upper left or right side of the heart. It grows on the wall that separates the two sides of the heart. This wall is called the atrial septum.
A myxoma is a primary heart (cardiac) tumor. This means that the tumor started within the heart. Most heart tumors start somewhere else.
Primary cardiac tumors are rare. Myxomas are the most common type of these rare tumors. About 75% of myxomas occur in the left atrium of the heart, usually beginning in the wall that divides the two upper chambers of the heart. The rest are in the right atrium. Right atrial myxomas are sometimes associated with tricuspid stenosis and atrial fibrillation.
Myxomas are more common in women. About 1 in 10 myxomas are passed down through families (inherited). Such tumors are called familial myxomas. They tend to occur in more than one part of the heart at a time, and often cause symptoms at a younger age.
Symptoms may occur at any time, but most often they go along with a change in body position.
Symptoms of a myxoma may include:
The symptoms and signs of left atrial myxomas often mimic mitral stenosis. Right atrial myxomas rarely produce symptoms until they have grown to be at least 5 inches wide.
Other symptoms may include:
The doctor or nurse will perform a physical exam and listen to your heart using a tool called a stethoscope. Abnormal heart sounds or a murmur may be heard. These sounds may change when you change body position.
Imaging tests may include:
Surgery is needed to remove the tumor. Some patients will also need their mitral valve replaced. This can be done during the same surgery.
Myxomas may come back if surgery did not remove all of the tumor cells.
Although a myxoma is not cancer, complications are common.
Untreated, a myxoma can lead to an embolism (tumor cells breaking off and traveling with the bloodstream), which can block blood flow or cause the tumor to grow in another part of the body. Pieces of the tumor can move to the brain, eye, or limbs.
If the tumor grows inside the heart, it can block blood flow. This may require emergency surgery to prevent sudden death.
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