A 52-year-old man with diabetes presented with recurrent, massive hemoptysis following pericardiectomy for pyopericardium secondary to Streptococcus viridans infection. Chest radiograph and bronchoscopic examinations revealed no bronchial cause. Computed tomography of the chest and echocardiography showed a pseudoaneurysm of the left ventricle. Surgical exploration confirmed that the pseudoaneurysm communicated with the left lung parenchyma and was the cause of recurrent intractable hemoptysis.