Whole Lung IMRT in Children and Adults With Synovial Sarcoma and Lung Metastases

External beam radiation therapy will be administered on an outpatient basis, once daily (except weekends and holidays) for approximately two weeks. Patients will undergo a simulation prior to initiation of radiation. Once an IMRT plan is generated which meets all dose constraints specified patients will be treated with 6MV photons for 10 treatments.