Histologically, this lesion shows plump, polygonal cells arranged in nests and fascicles with granular cytoplasm. Which immunohistochemical stain would be positive?

A. CD31

B. Synaptophysin

C. Factor XIIIa

D. S-100

E. CD34

To find out the correct answer and read the explanation, click here. 

Brought to you by our brand partner Derm In-Review.  A product of SanovaWorks.