The American Society of Dermatopathology

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Interactive Case Study - May 2013

8-year-old boy with subcutaneous nodule of the upper arm

Lauren N. Stuart, MD, MBA; Jerad M. Gardner, MD

Question 1:

An 8-year-old boy presented with an enlarging subcutaneous nodule on his right upper arm. The histologic findings are presented in the figures below.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Which of the following is the most likely diagnosis?