Basal Cell Carcinoma of the Female Breast Masquerading as Invasive Primary Breast Carcinoma: An Uncommon Presentation Site

Figure 5

IHC stain (SMA—smooth muscle actin) 20x shows the normal epidermis to be negative (which is what is expected), but the tumor cells show strong cytoplasmic positivity. The circles that are also staining is smooth muscle in normal blood vessels (positive internal control).