Interactive Case Study - September 2013

Mass on the foot of a 5-year-old girl

Amy M. Kerkvliet, MD; Tammie C. Ferringer, MD

A 5-year-old female presented with a mass on the medial plantar aspect of the right foot. The histopathology of the biopsy is shown below (Figures 1-3).

Figure 1. H&E, 20x

Figure 2. H&E, 100x

Figure 3. H&E, 400x

Which of the following is the best diagnosis?

A.	Soft tissue chondroma

B.	Plantar fibromatosis

C.	Giant cell tumor of tendon sheath

D.	Calcifying aponeurotic fibroma

E.	Calcifying fibrous tumor