Detection of isolated fetal limb anomalies using 3D/4D ultrasound

Objectives Demonstration of the advantage of 3D/4D ultrasound compared to 2D imaging in the precise detection and parental counseling of isolated fetal limb defects. Methods Prospective observational study of 201 fetal limb defects over a 30-year period (1994–2023) in a level III center. Results Comparison of 2D and 3D ultrasound showed a benefit in the precise demonstration of isolated limb abnormalities in 154 of the 201 cases (76.6 %), particularly in subtle malformations. In the demonstration of the defects to the parents-to-be, 3D/4D ultrasound was superior to 2D ultrasound in 100 % of cases by the fact that the abnormalities could be better understood by the parents when using a spatial presentation. Conclusions 3D/4D ultrasound is superior to 2D sonography in the demonstration of isolated limb defects, particularly in subtle limb defects.