Xanthogranulomatous Epithelial Tumor/Keratin-Positive Giant Cell

An adult man presented with a subcutaneous mass in the left shoulder. The tumor was resected. On histologic evaluation, it was composed of histiocytes and giant cells and showed numerous scattered keratin AE1/AE3–positive cells. On pathologic examination, the tumor was diagnosed as xanthogranulomatous epithelial tumor (keratin-positive giant cell–rich soft tissue tumor). Please select one of the following images.

Which statement is most accurate regarding xanthogranulomatous epithelial tumor (keratin-positive giant cell–rich soft tissue tumor)?

Xanthogranulomatous Epithelial Tumor/Keratin-Positive Giant Cell–Rich Soft Tissue Tumor