We present our experience of using HDlive studio and HDlive silhouette to diagnose uterine synechia at 18 weeks and 2 days of gestation. Two-dimensional (2D) sonography showed a narrow, transverse uterine synechia in the amniotic cavity. 2D color Doppler revealed arterial blood flow consistent with the maternal heart rate in the uterine synechia. HDlive silhouette clearly demonstrated a transverse, bridging uterine synechia in front of the fetal head, and fetal arm and leg behind the placenta. Magnetic resonance imaging (MRI) confirmed the oblique horizontal band-like synechia at 31 weeks of gestation. HDlive silhouette and HDlive studio provided a novel visual depiction of uterine synechia and allowed us to demonstrate the spatial relationships among the uterine synechia, placenta, umbilical cord, and fetus in the amniotic cavity.