The American Society of Dermatopathology

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Interactive Case Study - November 2021

Violaceous nodules on the extensor elbow of an adult female

Carli P. Whittington, MD ‎; Anne M. Stowman, MD; Deborah L. Cook, MD

Question 1:

A 33-year-old Caucasian female with history of well-controlled Crohn’s disease presented with two pedunculated violaceous nodules on the extensor surface of her left elbow. The lesions were asymptomatic, but had been present for approximately 9 months. They were treated with excision per patient preference.

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Figure 1. 4x

Figure 2. 20x

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Figure 5. 400x

Which of the following is the best diagnosis based on the clinical history and ‎histopathologic images?‎