患者男,62岁。以“体检发现‘双肾囊肿’10d”为主诉入院。体检及实验室检查无特殊。CT检查所见:两肾多发囊性低密度灶,直径0.5～5.0cm,大小不等,部分囊壁可见斑点状高密度钙化影。左肾上极见一直径约5.0cm囊性较低密度灶,平扫CT值约34HU,密度欠均匀,边缘尚清楚(图1),其余囊性? Male patient, 62 years old. To “physical examination found double renal cyst ’10d” as the main complaint. Physical examination and laboratory tests no special. CT examination seen: two renal cystic low density lesions, diameter 0.5 ~ 5.0cm, sizes, part of the wall visible spot-shaped high-density calcification. On the left kidney is very common diameter of about 5.0cm cystic lower density lesions, CT scan value of about 34HU, the density is less uniform, the edge is still clear (Figure 1), the remaining cystic?