We describe the case of a 45-year-old Japanese man who developed acute pericarditis following an acute pulmonary thromboembolism. He had developed shortness of breath 7 days prior to hospitalization and was admitted with severe dyspnea. Echocardiography and laboratory results were compatible with acute pulmonary thromboembolism, which was confirmed by contrast-enhanced chest computed tomography. On the third hospital day, he experienced chest pain exacerbated by inspiration. On the fourth hospital day, his body temperature increased to 39°C and echocardiography revealed circumferential pericardial effusion. A diagnosis of acute pericarditis was made and the patient was treated with colchicine and aspirin. On the fifth hospital day, his symptoms largely subsided. Auscultation revealed pericardial friction rub. Electrocardiography demonstrated diffuse ST-segment elevations. Twenty-four days later, computed tomography revealed the disappearance of both the pericardial effusion and pulmonary arterial emboli. This case was thought to be one of acute pericarditis following acute pulmonary thromboembolism.
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