The American Society of Dermatopathology

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Interactive Case Study - September 2018

62-year-old with patches on the knee

Jyoti P. Kapil, MD; Daniel Wimmer, DO

Question 1:

62-year-old Caucasian woman with a 10-year history of erythematous, asymptomatic tan patches on the knee presenting after a knee replacement without progression. Patient has history of rheumatoid arthritis.
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Figure 1.

Figure 2. 10x

Figure 3. 20x A

Figure 4. 20x B

Figure 5. 40x

Figure 6. CD68

What is the best diagnosis?