Question 1:
A 74-year-old man presented with a one-week history of an asymptomatic eruption of ecchymotic plaques on the chest with accompanying fever and lethargy. A biopsy shows the following histopathology on H&E (Figures 1-4) and immunohistochemical staining (Figure 5).
Click on the image to view the virtual slide
Figure 1. H&E, 2x
Figure 2. H&E, 10x
Figure 3. H&E, 20x superficial
Figure 4. H&E, 20x deep
Figure 5. CD20, 10x
Which of the following is the best diagnosis?