This study enrolls patients of any age with a diagnosis of synovial sarcoma. The purpose of this study is to establish a registry and biorepository for synovial sarcoma patients by collecting and storing data and biospecimens, such as blood, saliva and/or buccal (cheek) swabs, and tumor tissue. If you or your child are interested in participating in this study, please click on this REDCap Survey to complete a study interest form. A study investigator will contact you to discuss the study in more detail.