A myxoma is a benign (non-cancerous) growth in the heart. Myxomas can be as small as a few millimetres or grow to a few centimetres. Most myxomas develop in the area of the heart called the atrium, which is the top left chamber of the heart.

How common are myxomas?

Myxomas are more common in women. About 1 in 10 myxomas are passed down through families (inherited). These 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.

Why do myxomas form?

Although there is not a well-defined underlying cause for myxomas, it is suspected to be the result of a combination of environmental and genetic risk factors. Cardiac myxomas can cause valvular obstruction, leading to episodes of fainting, pulmonary edema, symptoms of right heart failure, or embolisms.