Dermal Mass – 10/25

Biopsy of this lesion reveals a poorly-defined dermal mass of small blue monomorphic round cells with scant cytoplasm and nuclear molding. Which histologic stain is most helpful in distinguishing this lesion from small cell lung carcinoma?

A. CK20

B. TTF-1

C. Chromogranin

D. Synaptophysin

E. Somatostatin

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

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