We report an unusual adult case of aneurysm associated with the ductus arte
riosus. A 67-year-old female, who suffered recurrent nerve palsy, was diagn
osed as having an aneurysm of the ductus arteriosus. The aneurysm, located
in the medial aspect of the aortic ischimus and projected toward the pulmon
ary artery, was successfully repaired using a Dacron patch. A pathologic re
view of the aneurysm revealed the degeneration of the aortic media.