Question 1:
A 60-year-old woman presented with a tender, rapidly growing nodule in her chest. A deep punch biopsy was performed.
Click this image to view the virtual slide
Figure 1. Clinical image
Figure 2. H&E, low power
Figure 3. H&E, high power
Figure 4. CK20, high power
Figure 5. CK7, high power
Figure 6.TTF-1, high power
What is the best diagnosis?