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Results of pathological examination of the tumor. (a) The mass consists of spindle cells in a random pattern, with collagen fiber and (b) staghorn-like vascular pattern (H and E staining, ×100). (c) Immunohistochemical staining, with CD34 positive for tumor cells. (d) STAT6 is strongly positive for the nuclei of the tumor cells. (e) The MIB-1 positive rate is 2%–4% (a and b, ×100; c-e, ×300)
