Hepatic hydrothorax is defined as a significant pleural effusion (usually greater than 500 ml) in a cirrhotic patient, without an underlying pulmonary or cardiac disease.

• 肝性胸水是指，没有潜在的肺或心脏疾病得肝硬化，发生严重的胸腔积液（通常大于500毫升）的患者。