Most pulmonary thromboemboli arise from the deep vein thrombosis, which have complete clinical and at least near complete roentgenographic and angiographic resolution within four to six week of the acute event.

But chronic pulmonary hypertension and cor pulmonale from unresolved pulmonary embolism complicate acute embolic episode with a frequency of less than 1 percent. Rarely pulmonary thromboemboli can result from right atrial thrombi.

We experienced a case of chronic thromoboembolic pulmonary hypertension, which wrose from right atrial thrombi in the patient with rheumatic valvaular heart disease and thoracic aorta atherosclerotics stenosis.