“…There is selective involution of the venous network, and the caudal part of the right vitelline vein and the cranial part of the left vitelline vein progressively obliterate, which produces the PV [ 1 , [10] , [11] , [12] ]. The major anatomic variants of the portal venous system include the congenital absence of the PV, absent branching of the PV, and preduodenal PV [ [1] , [2] , [3] , [4] , [5] , [6] , [7] , 10 , 13 , 14 ]. The APV is a rare anomaly, wherein a small-caliber vein directly branched from the PV [ 8 , 9 ], and DPV is a very rare developmental anomaly, which has been described only in case reports [1] , [2] , [3] , [4] , [5] , [6] , [7] .…”