… To our knowledge a sonographic feature able to differentiate the fetus with Down's
syndrome from the normal fetus has not been reported. We describe here a sonographic
sign that places the fetus at high risk for having Down's syndrome and therefore warrants
further testing. Nine hundred and four amniocenteses for genetic evaluation were
performed over 1 V2 years on fetuses at 15 to 18 weeks' gestation. At the time of the pro- …