Rhabdomyomas are rare benign tumors of skeletal muscle usually found in the area of the head and neck.
Rhabdomyosarcomas are malignant tumors of skeletal muscle. These tumors are typically found on the arms and legs. Over 85% of rhabdomyosarcomas occur in infants, children, and teenagers.
Leiomyomas are benign tumors of smooth muscle. These tumors are uncommon.
Leiomyosarcomas are malignant tumors of smooth muscle tissue. These are rare tumors in the USA.