Figure 4

Histopathological examination of the excised tissue. (A) Fibrosarcoma arising in a background of dermatofibrosarcoma protuberans showing proliferation of spindle cells with a prominent storiform pattern and cells exhibiting pleomorphism with increase mitotic activity (H&E, 10 ×). (B) Fibromatosis showing proliferation of bland spindle shaped cells with infiltration into the muscle at the periphery and perivascular lymphocytic infiltrate (H&E, 10 ×).