Portal vein thrombosis often occursin liver cirrhosis, ascending portal thrombophlebitis, pancreatitis, and other conditions and after sclerotherapy of a gastroesophageal varix [ 19]. It is important to assess portal venous patency in these diseases. Con trast-enhanced 3D MR portography provides detailed information not only aboutthe location and length of portal vein obstruction but also about portal collateral pathways. Over time, a network of small collateral vessels develops to bypass the portal venous occlusion. This network of collaterals, known as cavernous transformation, is identified by its characteristic enhancement pattern in the hepatic hilum during portal venous and equilibrium phases of 3D CE MRA.
Table 2 gives an overview of the accuracy of 3D MR portography. In potential candidates for liver transplantation, it is necessary to evaluate portal venouspatency . Color Doppler US may not allow portal venous patency to be established , but contrast-enhanced 3D MR portography provides accurate information.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.