Echocardiographic differentiation of a cystic and a solid tumor of the heart.

A hydatid cyst in the ventricular septum was diagnosed with echocardiography in a child with abdominal echinococcosis. The finding was confirmed with cardiac catheterization, cineangiography and surgical removal and pathologic examination of the cyst. The echocardiographic features of the fluid-filled hydatid cyst are contrasted with those of solid left ventricular tumor (rhabdomyoma) in a newborn.