Disappearance of a cardiac rhabdomyoma complicating congenital mitral regurgitation as observed by serial two-dimensional echocardiography.

A cardiac tumor was diagnosed by two-dimensional (2D) echocardiography in a four-month-old infant who also had congenital mitral regurgitation. At 18 months of age, histological examination of a biopsy specimen of the cardiac tumor, obtained during surgery for mitral valve replacement, revealed a rhabdomyoma. In serial postoperative 2D echocardiograms, this tumor decreased in size until total disappearance after 6 months.