Fig. 5.

Immunohistochemical findings a, b Both conventional AdCC (yellow arrow, a) and poorly differentiated carcinoma component (red arrow, b) show strong and diffuse positivity for CD117, whereas the sarcomatoid component is negative (yellow arrow, b) (a, b, × 100). c, d Vimentin highlights the myoepithelial cells in the conventional AdCC. c The sarcomatoid component is diffusely positive for vimentin (yellow arrow) (d, × 100) and is focally and weakly positive in poorly differentiated carcinoma component (red arrow) (d, × 100)