The American Society of Dermatopathology

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Interactive Case Study - October 2017

Tender nodule on left calf of a 48-year-old-male

Laleh Montaser Kouhsari, MD; Thomas M. Soike, MD

Question 1:

A 48-year-old male presented with a three-month history of enlarging, tender, left calf nodule. The clinical workup of this lesion included an ultrasound that showed a well-defined, non-cystic subcutaneous nodule with mild to moderate blood flow.

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Which of the following is the best diagnosis?