CD1+S100+ – Friday Pop Quiz 01/22


A 24 month-old infant presents with red-brown, crusted papules with petechiae in a seborrheic distribution. A biopsy is done to confirm a diagnosis. Which histologic picture is most likely?

A. CD1-, S100- cells with reniform nuclei

B. Foamy histiocytes with Touton giant cells

C. CD1+, S100+ cells with reniform nuclei

D. Mixed cellular infiltrate in a “ball and claw” pattern

E. Superficial perivascular infiltrate with mild spongiosis and neutrophil containing scale crust

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

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