大血栓能引起死亡。中等大小的血栓(堵塞通向一个肺叶或一组肺叶的肺动脉)能产生如图所见的损害--肺出血性梗死，该病人得以幸存。梗死灶呈楔形，基底部位于脏层胸膜上。尽管携带大部分血和氧气的肺动脉被切断，但发自循环系统的分支动脉(供应肺大约1%的血)并没被切断，因此出血性梗死相对来说不易发生。
Large thromboemboli can cause death. Medium sized thrombomboli (blocking a pulmonary artery to a lobule or set of lobules) can produce the lesion seen here--a hemorrhagic pulmonary infarction, because the patient survives. The infarct is wedge-shaped and based on the pleura. These infarcts are hemorrhagic because, though the pulmonary artery carrying most of the blood and oxygen is cut off, the bronchial arteries from the systemic circulation (supplying about 1% of the blood to the lungs) is not cut off.
