A myxoma (New Latin from Greek muxa 'mucus') is a myxoid tumor of primitive connective tissue.

Symptoms associated with cardiac myxomas are typically due to the effect of the mass of the tumor obstructing the normal flow of blood within the chambers of the heart.

The most common location for attachment of the stalk is the fossa ovalis region of the interatrial septum.

[9] An atrial myxoma may create an extra heart sound, audible to auscultation just after S2.

[citation needed] The differential diagnosis include other cardiac tumors such as lipomas and rhabdomyomas (and rarely teratomas).