We present the first report on the use of helical computed tomography (CT), a new, non-invasive diagnostic technique that produces three-dimensional (3-D) images, in prenatal diagnosis. This technique was used to construct 3-D images in the prenatal diagnosis of two anomalous fetuses. The 3-D images provided clear information about the anomalies: trisomy 18 in one case and cystic hygroma in the other. In one case, rapid intervention after a planned Caesarean section prevented respiratory distress. Surgery to correct the anomaly was performed 2 days postnatally; the infant recovered uneventfully.
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