Fig. 5
From: Prepancreatic postduodenal portal vein: a case report and review of the literature
Development of the prepancreatic postduodenal portal vein. In this variant the dorsal pancreatic bud lies not cephalad and ventral, as is in normal development (Fig. 4), but rather the opposite: caudal and dorsal to the middle anastomosis and the caudal segment of the left vitelline vein, respectively. Rotation of the pancreatic buds in a clockwise fashion results in a portal vein posterior to the duodenum but anterior to the pancreas. C1 caudal anastomosis, C2 cranial anastomosis, D duodenum, DP dorsal pancreatic bud, LPV left portal vein, LVV left vitelline vein, M middle anastomosis, P pancreas, PV portal vein, RVV right vitelline vein, VP ventral pancreatic bud