Figure 1.

The histologic features of PEComa: Spindle-cell type cells resemble smooth muscle cells with eosinophilic (A) or clear cytoplasm (B). Epithelioid cell type has bright and fine granulated cytoplasm. The nuclei are relatively small and round to oval shaped centrally located in cells (C). Admixed type contains a variety of fatty cells with different amounts of spindle or epithelioid tumor cells (D). Usually tumor cells are around or perpendicular to blood vessels (E). The nucleus is round or rodlike or oval or irregular with nuclear groove depending on the cell type (F). (A-E): 10 × 10; (F): 20 × 10.