The American Society of Dermatopathology

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Interactive Case Study - May 2014

A 63-year-old woman with an enlarging erythematous plaque on the forearm (with zoomable virtual slide)

Peggy Myung, MD, PhD; Jennifer Madison McNiff, MD

Question 1:

Clinical History
A 63-year-old woman presented with an asymptomatic slowly enlarging erythematous thin plaque over her extensor forearm. A biopsy of this lesion shows the following histopathology (Figures 1-3).

Click image to view Zoomable Digital Slide

Figure 1.

Figure 2.

Figure 3.

What is the best diagnosis?