Role of contrast-enhanced 3D magnetic resonance portography in evaluating portal venous system compared with color Doppler ultrasonography

Abstract

Results of present study indicates that contrast-enhanced 3D MR portography is well suited and superior to CDUS in the management of patients with portal hypertension.

Portal Vein Thrombosis

“…MR portographic demonstration of portal vein occlusion may be reported as normal on CDUS and vice versa due to slow flow velocity in portal vein. 99 True fast imaging with steady state precession (true FISP) with MRI has been shown to be a useful adjunct to contrast enhanced MR angiography in severely debilitated patients, where respiratory motion may degrade the images or when the use of contrast medium is not possible due to poor venous access. 100 MR portography is valuable in determining the resectability of neoplasm involving the portal venous system 101 and follow-up after therapeutic procedures 102 including surgical splenorenal and mesocaval shunts.…”

MRI findings of posttraumatic intrahepatic vascular shunts

“…3D images can be reformatted in any plane to produce high quality thin-section images with no gaps, allowing for improved detection and localization of small hepatic lesions, which can be used to generate high-quality images depicting the hepatic vasculature. MRI characteristics of the liver during hepatic arterial and portal venous phases of enhancement are very useful in detection and characterization of hepatic masses (8,13). In the evaluation of hepatic masses or liver transplant patients by MRI, radiologists may encounter PIVS; therefore, recognition of their appearance is imperative.…”

“…To date, however, no study has described the specific MR appearance of PIVS. The use of three dimensional (3D) gradient-recalled-echo (GRE) sequences, such as volumetric-interpolated breathhold examination (VIBE) has improved the ability to discern fine vascular detail on MRI by providing thin-section images with fat suppression and a high signal-to-noise ratio (12,13). 3D images can be reformatted in any plane to produce high quality thin-section images with no gaps, allowing for improved detection and localization of small hepatic lesions, which can be used to generate high-quality images depicting the hepatic vasculature.…”

MR Evaluation of Portal Hypertensive Collateral Shunting Vessels for Predicting Outcome after Transjugular Intrahepatic Portosystemic Shunt

“…Preprocedural cross-sectional imaging of the liver and portal system can detect important contraindications to TIPS placement, such as multiple or huge hepatic cysts or hepatocellular carcinomas or obstruction or thrombosis of the portal or hepatic veins. 1,[9][10][11][12][13][14] Many researchers have investigated the relationships between diameter of the portal vein and portal pressure, 16 ‰ow direction, 17 development of the shunting vessels, 18 diameter of the shunting vessels and gastroesophageal bleeding, 19 or onset of encephalopathy. 20 Ito and associates 21 recently reported decreased diameter and hepatopetal ‰ow of the left gastric vein and the presence of non-variceal portosystemic shunt as predictive factors for variceal relapse after endoscopic therapies.…”

“…[9][10][11][12][13][14] We aimed to assess whether MR imaging evaluation of portosystemic collateral shunts can be used to predict therapeutic eŠectiveness of, complications after, and technical di‹culty during TIPS creation.…”