图  1  胃镜所见

Figure  1.  Gastroscopic findings showing a roundish mass of about 1.6 × 1.8 cm2 and 1.3 × 1.5 cm2 in the esophagus intruding into the lumens, with erosion and errhysis in the luminal surface

图  2  PET-CT提示（黑色箭头所指）

Figure  2.  PET-CT scan showing slight thickening at the center of the esophagus and a mild radioactive concentration (SUVmax4.0) occupying the esophagus (black arrow)

图  3  光学显微镜检查（H & E×100）

Figure  3.  Light microscopy revealing that the tumor cells are roundish or polygonal and differ in nucleus sizes, including melanin granules of different maturity levels where the pathological mitotic figure is easily observed (H & E.×100)