Abstract
A 37-year-old man underwent a health examination, and a coin lesion was detected in his rt. lung field on chest radiograph. Chest CT showed a pulmonary vein aneurysm localized in the rt. V7+10. This pulmonary vein aneurysm enlarged without mitral valve disease over a period of three years. We performed segmentectomy of the rt. S9+10 to avoid the risk of thrombus formation in the pulmonary vein aneurysm and its rupture. The strategy for pulmonary vein aneurysm is controversial. In cases with the increasing size of an aneurysm without heart disease, surgical indication would be considered.
