Fig. 2

Morphological features of the tumor. Ill-defined tumor cells are diffusely distributed between the subcutaneous tissues (a,×100). Most of the tumor tissues are cellular with large plump spindle cells (b,×200) or round cells (c,×200). Some areas of the tumor have myxoid stroma and scattered small round tumor cells (d,×200). The tumor cells are spindle (e,×100) or round (f,×400) in different areas, both with abundant eocinophilic cytoplasm. The tumor cells are large and plump, showing no apparent pleomorphism. The nuclei of the tumor cells have small nucleoli without notable atypia and the mitotic activity is scarce (e, f,×400). The microscopic features of the primary tumor were the same as the recurrent tumor (g, ×100; h,×400)