老年女性，56岁。既往无腰部疼痛史，无 血尿史。超声检查发现右肾上极实质内可 探及稍增强回声，边界清楚，直径12mm， CDFI:稍增强回声内部未见明显血流信号， 2个月后复查，稍增强回声未见增大。诊 断可能为

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