The American Society of Dermatopathology

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Interactive Case Study - January 2018

Nail bed lesion

Robin Burger, MD; Jisun Cha, MD

Question 1:

The patient presented with a one-year history of an erythematous nodule right under his right second nail.

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Figure 1. Low Power

Figure 2. Medium Power

Figure 3. High Power

Figure 4. High Power X2

What is the best diagnosis?