The American Society of Dermatopathology

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Interactive Case Study - June 2012

A 79-year-old-male with a "lump" on the thigh

Xuehui (Susan) Liu, MD; Tammie Ferringer, MD

Question 1:

Clinical history: A 79-year-old male patient presented for evaluation of a “lump” located on his right upper inner thigh. The “lump” had been there for about 10 years; however, it had increased in size recently.  The gross appearance and the histology are shown below (Fig. 1-6)

Figure 1                                      Figure 2                                Figure 3       


Figure 4                                      Figure 5                                Figure 6                  

Which of the following is the best diagnosis?