Skin Lesion – Friday Pop Quiz 01/08

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. 

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