Question 1:
A 70-year-old man presented with a 2 year history of an asymptomatic, slowly growing
nodular lesion on the posterior aspect of the right auricle
. Physical examination of the auricle revealed a 0.5 cm nodule that clinically appeared to involve the underlying cartilage (Figure 1). Wide local excision showed a 1.4 cm ulcerated nodule with the following microscopic examination (Figure. 2-7).
Click this image to view the virtual slides.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
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Figure 7
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Which of the following is the best diagnosis?