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Angiosarcoma of the scalp. Histologically, the tumor was composed of aberrant vascular spaces, covered with atypical endothelial cells showing focal proliferation in the form of intraluminal buds ((a) HE, ×100; (b) HE, ×200). The tumor infiltrated the bone (asterisk) ((c) HE, ×100). Tumor cells showing immunohistochemical expression of CD31 ((d) ×200).
