By 3-dimensional echocardiography, the location, relation to the aortic and
tricuspid valve, and the size of the ventricular septal defect was assesse
d and compared with 2-dimensional echocardiography and intraoperative findi
ngs. We concluded that 3-dimensional echocardiography accurately assesses t
he anatomy of the ventricular septal defect, provides additional informatio
n, and can be considered a valuable preoperative diagnostic tool.