I am not sure mum. I just saw the below article and sharing it with you. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6060947/#:~:text=Fetal%20intra%2Dabdominal%20umbilical%20vein%20varix%20(FIUVV)%20is%20a,turbulent%20flow%2C%20and%20fetal%20anomalies.
Thank you for sharing🙂