Question 1:
A 34-year-old female presented to the general surgery clinic with a 3.5cm mass of the right breast for 3-4 months. The area was painful during menses. She denied nipple discharge or changes.
Click this image to view the virtual slide.

Figure 1. 20x

Figure 2.100x

Figure 3. 400x

Figure 4. CD34 200x

Figure 5. Desmin 200x

What is the best diagnosis?