en Cardiovascular Surgery Cardiovascular Surgery case report case report Patent ductus arteriosus (PDA) is an open communication between the upper descending thoracic aorta and the proximal left pulmonary artery, which results from persistence of the fetal ductus arteriosus. It may be isolated or occur with other congenital cardiac anomalies. Aneurysms of the ductus arteriosus are rare lesions which may occur as a spontaneous. infantile fonn or occur in later childhood oradult life. About60cases of ductus aneurysm have been reported in infants less than two months old, and only about 40 cases have been reported so far in adults in the world literature. In this report, a case of huge aneurysm of the ductus arteriosus in a five year old child associated with ventricular septal defect and pulmonary stenosis is presented, the first case of this kind in the literature, Successful surgical correction was performed. 49 52 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-1-401&slc_lang=en&sid=1 MOHAMMAD HASAN KALANTAR MOTAMEDI 20031947532846005252 20031947532846005252 Yes From the Departments of Cardiovascular Surgery Shahid Rajai Heart Hospital, Iran University of Medical Sciences, Tehran, Islamic Republic Of Iran. KAMAL RAISSI 20031947532846005253 20031947532846005253 No From the Departments of Cardiovascular Surgery Shahid Rajai Heart Hospital, Iran University of Medical Sciences, Tehran, Islamic Republic Of Iran. SM MERAJI 20031947532846005254 20031947532846005254 No From the Departments of•Pediatric Cardiology, Shahid Rajai Heart Hospital, Iran University of Medical Sciences, Tehran, Islamic Republic Of Iran