男性,58岁,间断肉眼血尿半年,血尿时尿中偶有血块,其间曾有2次左肾区绞痛史。静脉肾盂造影显示左肾上盏拉长并向内侧移位。B超提示左肾上极3cm低回声实性占位,其诊断最可能是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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