conclusions this case indicates that delineation of coronary artery anatomy in atypical congenital giant right atrial aneurysm is of vital importance. closure of the aneurysmal sac, instead of aneurysmal resection, is a safer and more simple approach in atypical cases. case presentation this is a report on a 3.5-month-old male infant with imperforated anus and an unusual-shaped congenital giant...