embryonal rhabdomyosarcomas

em·bry·o·nal rhab·do·my·o·sar·co·mas

(em'brē-ōn'ăl rab'dō-mī'ō-sahr-kō'măz) Malignant neoplasms occurring in children, consisting of loose, spindle-celled tissue with rare cross-striations; they arise in many parts of the body in addition to skeletal muscles.