Fig. 3From: Primary mediastinal clear cell sarcoma: a case report and review of the literature a Immunohistochemical examination showed positive expression of vimentin (magnification × 400). b Immunohistochemical examination showed positive expression of HMB45 (magnification × 400). c Approximately 30% of the tumour cells were positive for the proliferation marker (Ki67, magnification × 200). d Dual color interphase fluorescence in situ hybridisation utilizing the EWSR1 break-apart probe. Split red and green signals within a single cell demonstrated the presence of a EWSR1 rearrangement (indicated by white arrows)Back to article page