肺是大循环系统的“第一滤过器”,也是身体多种恶性肿瘤转移的“靶”器官;因为肺循环是低压系统,并有肺动脉和支气管动脉双重的血管支配,而且肺部的凝固-纤溶活性较高。以上因素决定了肺部是肿瘤转移最好发的部位。在整个肺部肿瘤的病因中,转移性肺癌占重要的位置。 The lung is the “first filter” of the large circulatory system and is also the “target” organ for the body’s many malignant tumor metastases; because the pulmonary circulation is a low-pressure system, with dual vessel dominance of the pulmonary and bronchial arteries, and coagulation of the lungs - Fibrinolytic activity is high. The above factors determine that the lung is the best site for tumor metastasis. Metastatic lung cancer occupies an important position in the cause of the entire lung tumor.