Table 1: Compares this case study to immunohistochemistry stains expected in basal cell carcinoma and its potential histological mimics.

 

Current Case

Basal Cell Carcinoma

Trichoepithelioma

Squamous Cell Carcinoma

Merkel Cell Carcinoma

Tumor of Follicular Infundibulum

Ber-EP4

+

+

-

-

+

-

CD10

+, basaloid

+, basaloid

+, stromal

+, stromal

-

+, stromal

BCL2

+, diffuse

+, diffuse

+, outer layer

-

+

-

CK20

-

-

+

-

+

-

CD34

-

-

+

-

-

+