3D/4D HDlive rendering images seem to be more readily discernible than those obtained by conventional 3D/4D sonography. 3D/4D HDlive may be an important modality in future embryonic research, fetal neurobehavioral assessment, and the evaluation of fetal anomalies.

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Observation of facial expressions using the 4D HDlive rendering mode is considered to reflect the normal and abnormal neurological development of the fetus. Therefore, the 4D HDlive rendering mode may assist in evaluation of fetal brain function, and offer potential advantages relative to conventional 4D ultrasonography.

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We present our experience of using the HDLive silhouette inversion mode to assess complete hydatidiform mole early in pregnancy. The HDLive silhouette inversion mode clearly depicted the number, size, and spatial position of molar vesicles, compared with conventional two-dimensional sonography or the HDLive inversion mode. Moreover, spatial relationships among molar vesicles, intrauterine anechoic fluid collection, and the uterine wall enabled the clear localization of the lesion. This technique provides new insights, and has the potential to supplement conventional two-dimensional sonography in the diagnosis of complete hydatidiform mole.