The American Society of Dermatopathology

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Interactive Case Study - December 2018

A 72-year-old male with a red papule on the upper back

Kathleen Graham, BS; Eric Hossler, MD; Brian Joel Tjarks, MD

Question 1:

A 72-year-old male presented with a red papule on the left upper back.
Click this image to view the virtual slide

Figure 1. 2x

Figure 2. 10x

Figure 3. 20x

Figure 4. 60x

Figure 5. CD68 20x

Figure 6. S100 60x

Which of the following is the best diagnosis?