CTSK and neoplasm: (Immunohistochemical stains showed that the tumor cells were positive for desmin and TFE3, while negative for pancytokeratin, CAM5.2, EMA, chromogranin, synaptophysin, NSE, CD45, SMA, HHF35, myogenin, CD117, DOG1, MUC4, S100, SOX10, HMB45, Melan-A, CD31, ERG, TLE1, STAT6, and Cathepsin-K).