SS18 and synovial sarcoma: Recently, Baranov et al. evaluated SSX-SS18 IHC in 100 genetically confirmed primary SS tumors and 300 histologic mimics of SS, demonstrating that SS18-SSX IHC had high sensitivity (95%) and high specificity (100%) for the diagnosis of primary SS and described that the test could replace traditional genomic tests based on its technical simplicity and high diagnostic performance [4].