摘要门静脉积气(PVG)是一种近年来引起广泛关注的影像学征象，其出现常伴严重或致命的情况。PVG本身并不是手术适应证，治疗主要取决于潜在的疾病，当伴有严重的潜在腹部疾病时，需要紧急手术干预。引起PVG的潜在疾病主要分为感染性、缺血性、机械性和医源性疾病。这些潜在疾病的预后与PVG是否存在无关，而是受疾病本身影响。尽管近年来有关PVG的报道越来越多，而对其致病机制的研究却甚少。基于对以往文献的回顾，本文讨论了有关PVG的致病机制、危险因素、影像学表现以及相关疾病的处理、预后。

abstractsPortal vein gas (PVG) is a kind of imaging sign which has been attracting widespread attention in recent years, and its appearance is often accompanied by serious or fatal situation. PVG is not an indication of surgery and the treatments depend on potential diseases. When there are serious potential abdominal diseases, the emergency surgical intervention will be needed. The potential diseases that cause PVG mainly include infectious, ischemic, mechanical and medical. The prognosis is not related with PVG, but is affected by the pathogenesis. Although more and more reports about PVG have been reported in recent years, the research on its pathogenesis is less. Based on the review of the previous literatures, the pathogenesis, risk factors, imaging manifestations, treatment and prognosis of PVG were discussed.