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Figure 3: Sections show a spindle cell tumor (a, ×100) composed of plump-to-spindled fibroblasts in fascicular and storiform patterns (b, ×200) with a dense plasma cell infiltrate (c, ×400). Tumor cells were focally immunopositive for smooth muscle actin (d, ×400)

Figure 3: Sections show a spindle cell tumor (a, ×100) composed of plump-to-spindled fibroblasts in fascicular and storiform patterns (b, ×200) with a dense plasma cell infiltrate (c, ×400). Tumor cells were focally immunopositive for smooth muscle actin (d, ×400)