Successful Intrasaccular Coil Embolization of Mycotic Pulmonary Artery Pseudoaneurysm Using the Balloon Remodeling Technique

A 66-year-old man with ventricular septal defect was hospitalized for fever, dyspnea, and hemoptysis. Infectious endocarditis by Streptococcus parasanguinis was suspected. At 3 weeks after admission, massive hemoptysis suddenly occurred. Contrast-enhanced computed tomography showed a 2-cm aneurysmal formation in the right lower pulmonary artery. Rupture of a mycotic pulmonary artery pseudoaneurysm was diagnosed. Pulmonary angiography showed a wide-necked pseudoaneurysm at the trifurcation of the anterior, lateral, and posterior basal segmental arteries of the right lower lobe. Intrasaccular coil embolization with the balloon remodeling technique was successfully performed, preserving residual pulmonary function distal to the pseudoaneurysm.