Plexiform fibrohistiocytic tumor of the foot.

Abstract

The first case of plexiform fibrohistiocytic tumor in the foot is presented in this article. The tumor developed on the dorsum of the left foot in a 14-year-old female. This tumor was originally described in 1988 by Enzinger and Zhang. Their study indicated that this tumor has a female predominance, median age of 14.5 years, 63% located in the upper extremities, 37.5% recurrence rate, and 3% metastasis rate. These tumors are very unique with a nodular pattern and a cellular component of histiocytes, fibroblasts, and multinucleated giant cells. Typically they are located within the deep dermis and subcutaneous tissue. Immunohistochemical preparations show that the tumor does not stain for S-100 protein, desmin, cytokeratin, factor VIII-related protein, or lysozyme. However, it does stain for alpha-1-antitrypsin, alpha-1-antichymotrypsin, alpha-smooth muscle-specific actin, vimentin, and CD68 antibody.