 The chromosomal translocation t(X;18), which generates SYT-SSX1 and SYT-SSX2 fusion products, is a sensitive marker for synovial sarcoma.     ///    "One lesion with histologic, immunohistologic, and ultrastructural features indeterminate for a diagnosis of synovial sarcoma or malignant peripheral nerve sheath tumor was studied and was positive for SYT-SSX1. "