Currently, ultrasonographic examination is part
of the management and planning for obstetric patients
and its important role is to detect fetal anomaly. Ultrasound
screening for fetal anomalies is conventionally
performed at 18 to 20 weeks of gestation. However,
recent data suggested that many fetal structural
abnormalities could be detected by ultrasound examination
at 11-14 weeks of gestation(1-5). Early diagnosis
of these conditions and the appropriate intervention
may be beneficial to the mother, both physically and
psychologically. This may either allow early reassurance
of normality, or enable the woman to make an early
decision on the affected pregnancy.