Postoperative pathological examination revealed undifferentiated embryonal sarcoma of the liver (Figure 6), and immunohistochemistry showed Desmin(+), S-100(+), Ki67(+, 45%), CD99(+), CD68(+), CD117 (-), CD31(-), ERG (-), EMA(-), CD34(-), Vimentin(-), SMA(-), STAT6(-), MDM2(-), Actin(-), HMB45(-), MyoD1(-), Myogenin(-), CK-P(-), CD45(LCA)(-). The gene discussed is PTPRC; the disease is undifferentiated (embryonal) sarcoma.