A 51-year-old woman with a giant pulmonary artery aneurysm was referred to our department for surgical opinion. Imaging study confirmed a large aneurysmal dilatation of the left pulmonary artery starting in the pulmonary trunk. There was no underlying pathology except for a pulmonary commissurotomy 20 years previously for a significant valvular pulmonary stenosis. The role of surgery in this entity is not well defined. We report the management of one case.