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Figure 1: Histological findings (high-power view [×400]) of malignant peripheral nerve sheath tumor. (a) Grade 1 malignant peripheral nerve sheath tumor – spindle cells arranged in fascicles, (b) Grade 2 malignant peripheral nerve sheath tumor – spindle cells with intermediate nuclear features without necrosis, (c) Grade 3 – pleomorphic spindle cells, mitotic figures, and necrosis, (d) focal S100 positivity of malignant peripheral nerve sheath tumor

Figure 1: Histological findings (high-power view [×400]) of malignant peripheral nerve sheath tumor. (a) Grade 1 malignant peripheral nerve sheath tumor – spindle cells arranged in fascicles, (b) Grade 2 malignant peripheral nerve sheath tumor – spindle cells with intermediate nuclear features without necrosis, (c) Grade 3 – pleomorphic spindle cells, mitotic figures, and necrosis, (d) focal S100 positivity of malignant peripheral nerve sheath tumor