has part has part has_part characteristic of part of has modifier abnormal vein morphology abnormal ductus venosus morphology MP:0013873 any structural anomaly of the embryonic connection between the portal vein and inferior vena cava formed by the left umbilical vein that allows oxygenated blood to bypass the developing liver during the time when this connection is normally open; this normally closes during develpment to adulthood morphology abnormal ductus venosus