What is Preduodenal portal vein?

Preduodenal portal vein (PDPV) is a rare anomaly in which the portal vein is located anterior to the second part of the duodenum and represents 4% of all cases of duodenal obstruction. 1. This anatomical abnormality can result in an upper gastrointestinal tract partial or complete obstruction.

What is the portal vein in the liver?

The portal vein (PV) is the main vessel of the PVS, resulting from the confluence of the splenic and superior mesenteric veins, and drains directly into the liver, contributing to approximately 75% of its blood flow [1]. Hepatic artery provides the remaining hepatic blood flow.

What is portal venous system?

The portal venous system refers to the vessels involved in the drainage of the capillary beds of the GI tract and spleen into the capillary bed of the liver. Blood flow to the liver is unique in that it receives both oxygenated and deoxygenated blood.

What flows into portal vein?

The portal vein or hepatic portal vein (HPV) is a blood vessel that carries blood from the gastrointestinal tract, gallbladder, pancreas and spleen to the liver. This blood contains nutrients and toxins extracted from digested contents.

Why is the late portal venous phase called the hepatic phase?

The late portal venous phase is also called the hepatic phase because the enhancement of the hepatic veins also takes place during this phase. If the hepatic veins’ enhancement is not seen at this phase, it means that the scanning is being done too early.

When to start scanning the portal venous phase?

The Portal Venous Phase. The principle behind the portal venous phase imaging is precisely opposite to that of arterial phase imaging. The right time to start the scanning is in the late portal venous phase, i.e. approximately 75 seconds after the IV contrast has been administered.

When does the portal venous system form in the fetus?

From an embryological point of view, the portal venous system is formed from the 4th to the 12th gestation week, developing from the vitelline venous system in close relation with the umbilical venous system. The typical branching pattern of the main portal vein occurs in 65% of individuals in the general population.

What is the typical branching pattern of the main portal vein?

The typical branching pattern of the main portal vein occurs in 65% of individuals in the general population. The imaging modality of choice for portal venous system evaluation will depend on the clinical context, patient characteristics, local availability, and expertise.