Question 1:
A 75-year-old man presents with violaceous papules and nodules on the torso and face. The lesions are painless and have been continuously growing since onset four months ago.
Click this image to view the virtual slide.
Figure 1: H&E 4x
Figure 2: H&E 20x
Figure 3: CD4 20x
Figure 4: CD56 20x
Of note, immunohistochemical staining of the process was negative for CD3, CD8, CD20, and myeloperoxidase (MPO). Additional staining at an outside institution were positive for CD123 and TCF4.
Which of the following is the best diagnosis?