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Figure 4: Hematoxylin-eosin staining showed that tumor cells characteristically demonstrated spindle cell architecture with Antoni A and B areas (a). Tumor cells were negative for Type 4 collagen (b), and positive for S-100 protein (c) and Factor VIII (d)

Figure 4: Hematoxylin-eosin staining showed that tumor cells characteristically demonstrated spindle cell architecture with Antoni A and B areas (a). Tumor cells were negative for Type 4 collagen (b), and positive for S-100 protein (c) and Factor VIII (d)