Table 1.
Definition of major hepatic venous tributaries
| Tributaries of the LHV |
| Left superficial vein (LSV) |
| A tributary of the LHV or an isolated vein draining into IVC, not observed on the left portal fissure, running beneath the diaphragmatic surface of Segment II, and draining cranial portion of Segment II |
| Umbilical fissure vein (UFV) |
| A tributary arising from the LHV, MHV, or their confluence, not observed on the left portal fissure, running toward the umbilical fissure, and draining both Segment III and Segment IV |
| Tributaries of the MHV |
| Superior vein for Segment IV (V4sup) |
| A tributary of the LHV, MHV, or their confluence, not observed on the umbilical fissure, draining superior part of Segment IV, and never draining left side of umbilical fissure |
| Inferior vein for Segment IV (V4inf) |
| Tributaries of left peripheral portion of the MHV, draining inferior half of Segment IV, and usually forming the MHV trunk meeting with the drainage veins of Segment V |
| Ventral vein for Segment VIII (V8v) |
| A tributary of MHV, draining ventral part of Segment VIII and not draining dorsal part of Segment VIII |
| Intermediate vein for Segment VIII (V8i) |
| A tributary of the MHV, not observe on the main portal fissure, running between ventral and dorsal part of Segment VIII, and draining both ventral and dorsal part of Segment VIII |
| Veins for Segment V (V5) |
| Tributaries of right peripheral portion of the MHV, draining Segment V, and forming the MHV trunk meeting with the inferior veins for Segment IV |
| Tributaries of the RHV |
| Right superficial vein (RSV) |
| A tributary of the RHV or an isolated vein draining into IVC, running beneath the diaphragmatic surface of Segment VII, and draining cranial portion of Segment VII |
| Dorsal vein for Segment VIII (V8d) |
| A tributary of RHV, draining dorsal part of Segment VIII and not draining ventral part of Segment VIII |
| Accessory veins |
| Inferior right hepatic vein (IRHV) |
| An isolated vein draining into IVC, usually running along P6 and draining entire or caudal part of Segment VI |
| Middle right hepatic vein (MRHV) |
| Isolated veins draining into IVC, draining Segment VII, never draining Segment VI |