Figure 1

A and B, gross appearance of tumor. The mass with part of thin fibrous capsule (A) and the cut surface was solid, tan-white and had a faint fascicular pattern (B). C, The frozen section, a little ice crystals in the tissue, HE400. D-G, Bland-appearing, round, spindled, elongated, ribbon cells with abundant eosinophilic cytoplasm and eccentrically placed, oval nuclei rhabdomyocytes with cross-striations. No mitosis or atypia is noted. Mononuclear cells infiltrate. D, HE100; E, HE200; and F&G, HE400.