Proliferative fasciitis in the abdominal region.

A 30-year old man with no trauma history presented to our department of dermatology with a 2-year history of abdominal painful masses. The spontaneous pain and tenderness in the abdominal region gradually worsened. Physical examination revealed 3 firm, irregular subcutaneous nodules measuring 1 x 0.5 cm, which were movable and unattached to the overlying skin. One of the nodules was ulcerated (Figure 1). Histopathologic examination showed spindle-shaped fibroblast cells intermingled with gangliocyte-like giant cells in the hypodermis with an infiltrate made of lymphocytes and histiocytes (Figure 2 and Figure 3). The immunohistochemical staining showed the negativity of the fusiform cells and the gangliocyte-like cells to anti-S100 protein and to anti-smooth muscle actin.