Fig. 4
From: Synovial sarcoma presenting as an intra-articular mass in a pediatric patient: a case report
a Well-circumscribed nodule in the synovium (H&E staining, 2×) b Sub-synovial monomorphic spindle cell sarcoma (synovial lining is on the left side); (H&E staining, 10×). c Monomorphic spindle cell sarcoma with brisk mitotic activity (H&E stain, 20×). d Tumor cells showing patchy cytoplasmic positivity for cytokeratin 19 (immunohistochemistry CK19, 20×) e. Tumor cells showing diffuse nuclear positivity for TLE-1 (immunohistochemistry TLE-1, 20×). H&E: hematoxylin and eosin