Figure 1:
On low power examination the tumor shows a biphasic pattern consisting of epithelial and sarcomatoid elements (Fig. 1, H&E x 4).
Figure 2:
On higher power examination the epithelial component displays high-grade atypia (Fig. 2, H&E x 20).
Figure 3:
On higher power examination the sarcomatoid component consists of a proliferation of high-grade pleomorphic spindle cells (Fig. 3, H&E x 20).