Interactive Case Study - September 2012

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:

A.  Fibrous hamartoma of infancy

B.   Nodular fasciitis

C.  Myxofibrosarcoma

D.  Low grade fibromyxoid sarcoma

E.  Fibromatosis