Assertion: portal vein | /r/CapableOf | extend into superior mesenteric vein
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Source sentences:
text: PVT can be classified as (1) thrombosis of the portal vein only, distal to the splenic and superior mesenteric vein confluence; (2) thrombosis of the portal vein that extends into the superior mesenteric vein; (3) thrombosis of the portal vein, superior mesenteric vein, and splenic vein associated with large collaterals; or (4) thrombosis of the portal vein, superior mesenteric vein, and splenic vein associated with fine collaterals.