Fig. 11From: A new classification of congenital abnormalities of UPVS: sonographic appearances, screening strategy and clinical significanceGrayscale ultrasound image and pulsed Doppler image demonstrate the constriction of the umbilical vein. Images a and b illustrate the membranous constriction of the umbilical vein (arrow) in the intra-abdominal section. Images c and d show constrictive umbilical vein at a free loopBack to article page