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肝脏功能复杂、工作负荷繁重，各种遗传及环境因素的相互作用可导致各种肝脏疾病。而且，其他系统的疾病也可能累及肝脏并产生相应的表现，如肝功能试验异常、门静脉或肝静脉血栓形成、门静脉高压症、肝脾肿大及肝占位等。深入理解其他系统特别是血液、结缔组织、内分泌及循环系统疾病的肝脏表现，对于提高肝病医生的临床诊疗水平极为重要。

Liver have complex functions with a high workload. Various liver diseases are the result of the interaction of diverse genetic and environmental factors. Moreover, other systemic diseases may also affect liver, producing corresponding manifestations, such as abnormal liver function tests, portal vein or hepatic vein thrombosis, portal hypertension, hepatosplenomegaly and liver space-occupying lesions. Therefore, it is extremely important for hepatologists to have an in-depth understanding of other systemic diseases of hepatic manifestations, especially hematologic, connective tissue, endocrine, and circulatory, in order to improve the level of clinical diagnosis and treatment.