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A portacaval anastomosis (also known as porto-systemic anastomosis or portal caval system) is a specific type of anastomosis that occurs between the veins of portal circulation and those of systemic circulation. The inferior end of the esophagus and the inferior part of the rectum are some of the most important sites of portal systemic anastomosis. In portal hypertension, as in the case of cirrhosis of liver, the anastomoses become congested and form venous dilatations. Such dilatation can lead to esophageal varices and rectal hemorrhoids. Caput medusaes can also result.〔''Gray's Anatomy for Students'' Gray H, Drake R, Vogl W, Mitchell A, Tibbitts R, Richardson P. Philadelphia: Elsevier/Churchill Livingstone; 2010. p. 226〕 Specific types include: It can be one of the conditions caused by portal hypertension. A useful mnemonic is that portal hypertension causes problems in the butt, the gut, and caput. A dilated inferior mesenteric vein may or may not be related to portal hypertension. ==References== * Compendio de Anatomía humana. Testut- LaTarjet Clinically Oriented Anatomy. Keith Moore. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Portacaval anastomosis」の詳細全文を読む スポンサード リンク
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