The American Society of Dermatopathology

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Interactive Case Study - September 2012

Four-year-old with a flank mass

Steven D. Billings, MD

Question 1:

A four-year-old girl presented with a new soft tissue mass on the flank.  The clinical differential diagnosis included lipoma versus cyst.  The histologic findings are presented in the figures below.

Figure 1


Figure 2


Figure 3

Figure 4

The best diagnosis is: