SSX1 and synovial sarcoma: Synovial sarcoma is a mesenchymal spindle cell tumor which displays variable epithelial differentiation and has a specific chromosomal translocation t(X; 18) (p11; q11), which results from the fusion of the SYT gene on chromosome 18 to exon 5 of either SSX1 or SSX2 genes on chromosome X [6].