 Pulmonary synovial sarcoma is a rare neoplasm recently recognized as a distinct entity and characterized by t(X;18) translocation and production of at least 2 fusion genes, SYT-SSX1 and SYT-SSX2.     ///    SYT-SSX2 variant of primary pulmonary synovial sarcoma with focal expression of CD117 (c-Kit) protein and a poor clinical outcome..     ///    We report a case of primary pulmonary synovial sarcoma with the SYT-SSX2 phenotype and a rapidly progressive downhill course.     ///    Previous reports have suggested that the soft tissue synovial sarcomas with SYT-SSX2 phenotype have a favorable clinical outcome. 