男性,48岁。B超查体时发现左侧肾下极有一4.5cm×3.2cm实性占位,肾门处有一直径1.5cm肿物。静脉肾盂造影:两肾无异常改变。若肿瘤巨大,可先行肾动脉栓塞,然后再行手术。其主要目的是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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