患儿男性,3岁。发现左侧腹部肿块14天。查体:腹部稍膨隆,左中腹部触及一肿块,拳头大小,质韧,边界清,活动度可。IMR示左腹部巨大肿块影,界清,大小约8cm×9cm,信号不均匀,考虑恶性肿瘤(图1)。胸部X线未见明显异常。血、尿常规及血生化正常。术中见肿瘤位于腹膜后,结节样,包膜完整 Children with children, 3 years old. Abdominal mass was found on the left for 14 days. Physical examination: the abdomen slightly bulging, touching a lump in the left middle abdomen, fist size, quality and toughness, boundary clearance, activity can be. IMR showed a huge mass of the left abdomen shadow, clear, about the size of 8cm × 9cm, the signal is not uniform, consider the malignant tumor (Figure 1). No obvious chest X-ray abnormalities. Blood, urine and blood normal. Surgery see the tumor located in the retroperitoneal, nodular, complete capsule