Superior Mesenteric Vein Anatomy

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The mesenteric venous anatomy (Fig. 1) parallels the arterial distribution (see VI.3) [3-4]. The portal vein is formed by the splenic and superior mesen-teric veins. The pancreatic, left gastroepiploic, short gastric, and inferior mesenteric veins and splenic vein branches drain into the main splenic vein. The inferior mesenteric vein receives its supply from the left colic, sigmoid and superior hem-orrhoidal veins. It usually joins the splenic vein prior to the junction of the splenic vein with the superior mesenteric vein. The superior mesenteric vein receives its contribution from jejunal, ileal

Inferior Mesenteric Vein Anatomy

Fig. 1. Normal anatomy of the portal venous system A Portal vein

B Superior mesenteric vein C Inferior mesenteric vein D Lienal vein

Fig. 1. Normal anatomy of the portal venous system A Portal vein

B Superior mesenteric vein C Inferior mesenteric vein D Lienal vein

I Right branch of the portal vein

II Left branch of the portal vein a Coronary and pyloric veins b Right and left gastroepiploic veins c Superior hemorrhoidal vein d Hemorrhoidal plexus e Middle and inferior hemorrhoidal veins

Table 1. Overview of MR-contrast agents currently approved in Europe

Commercial

Laboratory

Generic

Manufacturer

T1 relaxivity*

Name

Name

Name

mmol-1 sec1

Magnevist®

Gd-DTPA

Gadopentetate dimeglumine

Schering

4.8

Gadovist®

Gd-BT-DO3A

gadolinium-DO3A-butriol

Schering

5.6

Dotarem®

Gd-DOTA

Gadoterate meglumine

Guerbet

-

Omniscan®

Gd-BMA

Gadodiamide

Amersham Health

4.4

ProHance®

Gd-HP-DO3A

Gadoteridol

Bracco

4.9

MultiHance®

Gd-BOPTA

Gadobenate dimeglumine

Bracco

9.7

* in plasma at 0.47 T and 20 mHz

right colic, and middle colic veins. The coronary veins (right and left gastric veins) usually drain directly into the portal vein. The portal vein then divides into the right and left portal branches at the porta hepatic. Approximately one half of patients have the portal vein bifurcation outside the liver capsule. A common normal variant of the portal venous system is trifurcation of the main portal vein, which is present in about 8% of patients. In these patients, the main portal vein divides into the right posterior segmental branch, the right anterior segmental branch, and the left portal vein.

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