Aneurysm of the branch pulmonary arteries are rare. The treatment options vary from case to case and include either surgery or percutaneous transcatheter treatment. The authors report a case of a 13-year-old boy who presented with a large pseudoaneurysm arising from the left lower lobe pulmonary artery. It was treated successfully by occluding the neck of the pseudoaneurysm by endovascular deployment of a patent ductus arteriosus closure device across it. There were no complications and the repeat computed tomography angiography of the patient at 3 weeks followup revealed no flow inside the thrombosed smaller aneurysm.