Figure 1

A, The tumor cells were arranged in nests on the right area (green arrow); while the normal parotid gland tissue was on the left area (red arrow). B, The area of necrosis and hemorrhage could also be seen easily (black arrow). C, The large vascular spaces could be seen on peripheral area of the whole section. D, Solid areas showed anaplastic cells with prominent nucleoli and no clear-cut vasoformation.