Most rhabdomyomas actually usually regress spontaneously.

大多数横其会自发消退。

The most common primary cardiac tumor in infants and children are rhabdomyomas.

婴儿和儿童最见的原发性心脏肿是横。

Rhabdomyo refers to striated muscle tissue, or cardiac muscle tissue in this case, so rhabdomyomas are benign tumors of the heart that usually affect the ventricles, and are best considered hamartomas rather than a true neoplasm.

横指的是条状的肉组织，这里就指心；横是良性肿，且累及心室，最好被认为错构而非肿。