Misdiagnosis of scalp angiosarcoma: A case report

Figure 4 Morphological features of the angiosarcoma. A: Under low magnification: The tumor cells diffusely infiltrated the dermis, involving the skin appendages and ulceration; B: Under high magnification: Proliferated vessels with fissures were composed of vascular endothelial cells with heteromorphic hyperplasia and nucleoli, and red blood cells were extravasated; C: Under high magnification: The intense positivity for an antiCD34 antibody shows that angiosarcomatous cells formed irregular vessels; D: Under high magnification: A high mitotic index was confirmed by immunohistochemical study for Ki67.