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

Inclusion Criteria: * Patients with synovial sarcoma confirmed by MSKCC pathological review * Patients with single or multiple lung metastases at diagnosis or that develop over the course of treatment. After completion of all chemotherapy, lung metastases or must be ≤ 2cm. * Age ≥12 months of age * Karnofsky performance status (KPS) must be ≥ 70 for patients ≥ 16 years of age and Lansky performance status must be ≥ 70 for patients \< 16 years of age. * Normal cardiac function * No active coronary artery disease; * No New York Heart Association class II, III or IV disease; * No arrhythmia requiring treatment. * Baseline echocardiogram with a shortening fraction of ≥27% or an ejection fraction ≥ 50%. * Female patients of childbearing potential must have a negative pregnancy test within 14 days of radiation start. * Female patients who are lactating must agree to stop breast-feeding. * Sexually active patients of childbearing potential must agree to use effective contraception. Exclusion Criteria: * Patients with a history of prior radiation therapy to the thorax. * Patients requiring a field size \>40 cm as IMRT cannot be performed at extended SSDs. * Patients with any concurrent medical or psychiatric condition or disease which, in the investigator's judgment, would make them inappropriate candidates for entry into this study.