Abstract: Recurrent pulmonary thromboembolism is a rare disease. There is no prominent symptom in its early stage, but in the later period cot pulmnale can be found. The main changes in this disease are recurrent thrombosis and thrombus organization in the pulmonary artery, therefore, it can lead to different vascular obstruction. The resistence of pulmnary circulation increases following the severity of obstruction, cor pulmonale can occur and finally leading to death of the patient. Sometimes, acute embolism of a larger pulmonary artery can also be lethal. This article has summarized the pathological characteristics of the recurrent pulmonary thromboembolism after searching three patients. It shows that the damages mainly occur in the arterial system, especially large and medial arteries, and the thrombus is apt to produce organization and reca- nalization.

Key words: thrombus, erabolism, organization, obstruction, lung