An unexpected pulmonary arterial aneurysm in a COPD patient.

We present a case of an idiopathic pulmonary artery aneurysm in an asymptomatic patient who was treated for an irrelevant medical condition. Pulmonary artery aneurysms (PAA) are quite rare and can either be congenital or acquired. Congenital aneurysms are usually associated with cardiac malformations leading to pulmonary hypertension. Acquired aneurysms can be idiopathic or associated with infections (tuberculosis, syphilis), trauma, pulmonary valvular stenosis, or collagen diseases. Pulmonary artery aneurysms are not common and an idiopathic pulmonary artery aneurysm is a rare finding that could be diagnosed incidentally.