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男性，36岁。诊断左房黏液瘤，拟在体外循环下手术。术前患者突然发生上腹部持续性剧烈绞痛，伴有频繁呕吐。查体：上腹部压痛，肌紧张。该患者最可能的诊断是（）
A . 急性胃穿孔
B . 急性胆囊炎
C . 急性腹膜炎
D . 肠系膜上动脉栓塞
E . 以上都不是
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