Diffuse rhabdomyomatosis of the heart.

The myocardium of a 13-year-old boy was infiltrated with cells like those of classical congenital rhabdomyoma. In contrast to the latter condition, in which distinct nodules are present, our patient had an infiltrated myocardium without a distinct tumor formation. The condition is similar to that reported earlier and may be designated as diffuse rhabdomyomatosis.