题目内容

患者，男性50岁，3个月前发生上消化道出血，经检查，证实为食管静脉曲张，二天前再次出现呕血、黑便，来院急诊，过去有乙肝病史20余年，此病人诊断为门脉高压。上消化道出血，其原因最可能为

A. 肝外门静脉阻塞
B. 肝静脉阻塞
C. 肝窦内阻塞
D. 脐静脉阻塞
E. 门静脉主干血栓形成

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