The data that support the findings of this study are available from the corresponding author upon reasonable request. Figure S1 Schematic illustration of complete course of a complex portocaval shunt (green vessel) observed in a fetus at 32 weeks' gestation, originating from main portal vein (MPV), ascending toward diaphragm, making a sharp caudal turn, crossing anterior to abdominal aorta (Ao) and terminating in inferior vena cava (IVC). Left renal vein (LRV) is shown draining directly into the shunt (red circle). Arrows show direction of blood flow. SMV, superior mesenteric vein; SpV, splenic vein. Figure S2 Oblique transverse color Doppler transabdominal ultrasound imaging of fetal abdomen at 32 weeks' gestation and pulsed-wave Doppler trace, showing normal course of ductus venosus with its characteristic triphasic waveform. Videoclip S1 Color Doppler with HD-Flow transabdominal ultrasound imaging of fetus at 32 weeks' gestation, demonstrating dynamically the complete course of a portocaval shunt through continuous planes, showing origin from main portal vein, cranial–caudal loop, relation to abdominal aorta and termination in inferior vena cava. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
Zhu et al. (Sun,) studied this question.