Longitudinal gray scale sonogram of the left lobe of the liver at the age of 6 months depicts partial resolution of the thrombus (white arrow) within the left portal vein, as the sonographic signal of the intraluminal thrombus decreased in size and became hyperechoic over time, with the adjacent ligamentum teres (open arrow) as a result of the involution of the umbilical vein via fibrotic transformation