Keywords: سارکوم نرم بافت; Sarcoma de partes blandas; Rabdomiosarcoma alveolar; Rabdomiosarcoma embrionario; PediatrÃa; Resonancia magnética; Soft-tissue sarcoma; Alveolar rhabdomyosarcoma; Embryonal rhabdomyosarcoma; Pediatrics; Magnetic resonance imaging;