“A rhabdomyoma is a noncancerous (benign) tumor that typically grows in clusters in the heart. Rhabdomyomas are the most common type of cardiac tumors seen in infants and children.
Cardiac rhabdomyomas usually grow in the muscles of the left and right ventricles (the lower chambers of the heart). More rarely, the tumors grow in the interventricular septum (the wall between the ventricles) or in the atria (the upper chamber of the heart).
Rhabdomyomas develop before birth — usually during the third trimester of pregnancy. If a tumor grows large enough, it can block blood flow through the heart. Smaller tumors may not cause any symptoms. In many cases, rhabdomyomas shrink on their own during a child’s first few years.” Read More