has part has part has_part characteristic of has modifier dilated vasculature abnormal hepatic portal vein morphology dilated hepatic portal vein dilated portal veins portal vein dilation an expansion in the lumen volume of the wide short vein formed from the confluence of the superior mesenteric, inferior mesenteric and splenic veins, which then divides into the right and left branches which ramify with the liver dilated HPV HPV dilation hepatic portal vein dilation dilated hepatic portal veins MP:0013813 dilated portal vein abnormal dilated hepatic portal vein