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?