[Bilateral Peripheral Pulmonary Artery Aneurysms:Report of a Case].

Pulmonary artery aneurysms are extremely rare and can be fatal if ruptured. We report the case of a 72-year-old man who underwent coil embolization of bilateral peripheral pulmonary artery aneurysms. Ten years ago, a left upper lobe nodule was incidentally noted on a chest computed tomography (CT). The nodule was suspected as a benign tumor and followed up. As it gradually enlarged, the patient referred to our hospital. Chest CT showed a 2.0-cm nodule in S1+2 of the left lung and a 0.6-cm nodule in S10 of the right lung. Contrast-enhanced CT showed that each nodule had the same contrast enhancement as the pulmonary artery. The left upper lobe nodule and the right lower lobe nodule were connected by a shunt with A1+2b and A10. They were diagnosed as pulmonary artery aneurysms, and coil embolization was performed. Eighteen months later, no enlargement of the pulmonary artery aneurysms or new lesions were observed.