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Histological examination. A: Spindle-shaped neoplastic cells exhibiting marked nuclear pleomorphism with whorled shape and fascicular clusters (HE stain; magnification × 400); B: Necrotic areas seen between the clusters of neoplastic cells (HE stain; magnification × 40); C: Immunohistochemical examination reveals positive staining of CD31 (magnification × 200). HE: Hematoxylin and eosin.
