Feature | BCC | TE |
---|---|---|
BCC, basal cell carcinoma; CK, cytokeratin; TE, trichoepithelioma. | ||
Histology | Increased mitoses | Mitoses not increased |
Retraction spaces | Retraction spaces not present | |
Usually no horn cysts | Horn cysts usually present | |
Stromelysin 3 | Positive in stroma | Negative |
CD10 | Positive in basaloid cells | Positive in stroma |
CD34 | Negative | Positive in stroma |
Bcl-2 | Diffusely positive in basaloid cells | Positive in peripheral cells only |
Ki-67 | Increased (20–40%) | Normal (rare cells) |
CK 15 | Negative | Focally positive |
CK 20 | Negative | Focally positive |