患者男，５７岁。于１个月前无明显诱因感觉左侧腰背部钝痛，不剧烈，持续性逐渐加重，于当地医院给予抗炎治疗无效而转我院。实验室检查无异常。ＣＴ检查：左肾前上方，胰后见一约４ｃｍ×４ｃｍ大小圆形软组织密度块影，其后方有低密度区，界限清晰，与肾上极关系紧邻，... Male patient, 57 years old. One month ago, there was no obvious incentive to feel the dull pain on the left lower back, not intense, and the duration continued to worsen. I was given anti-inflammatory treatment in a local hospital and transferred to our hospital. No abnormalities in laboratory tests. CT examination: the upper left anterior kidney, pancreas see a circular soft tissue density shadow about 4cm × 4cm size, behind the low density area, the boundaries are clear, and the upper pole of the kidney, ...