Fig. 1

Schematic figures of the Heidelberg triangle classification. A Ventral view of the type I Heidelberg triangle. Yellow shading refers to the interior of the Heidelberg Triangle. B Lateral view of the type I Heidelberg triangle. The interior of the Heidelberg triangle, shown in yellow, is defined as the triangular plane formed by the posterior edge of the CA-CHA, SMA, and PV-SMV vessels extending to the plane of the inferior vena cava and left renal vein. C Ventral view of the type IIa Heidelberg triangle. D Ventral view of the type IIv Heidelberg triangle. Abbreviations: AA, abdominal aorta; CA, celiac axis; CHA, common hepatic artery; SMA, superior mesenteric artery; SPA, splenic artery; LGA, left gastric artery; α-RHA, variant right hepatic artery; LHA, left hepatic artery; RHA, right hepatic artery; LGV, left gastric vein; SMV, superior mesenteric vein; PV, portal vein; IVC, inferior vena cava; LRV, left renal vein