Fig. 4

a, b The tumor is removed during the operation, and the tumor is approximately 10.0 × 8.0 × 5.0 cm in size, with a lobulated shape; the specimen of the tumor is fatty. c Under low magnification (4×), the perimeter of the tumor is clear. There is an envelope consisting of lobular or sheet-shaped polygonal or quasi-round tumor cells. Mature adipocytes can be seen between tumor cells. d Under high magnification (400×), the tumor cells have a thick envelope, rich cytoplasm, an eosinophilic red color (eosinophilia), and granular or fine vacuoles. The nucleus is small and round, deeply stained, and centered