Non-tumoral portal vein thrombosis in liver transplantation: Surgical perspectives and institutional protocol

Table 1 Main classification systems for non-tumoral portal vein thrombosis

	Grade 1	Grade 2	Grade 3	Grade 4
Yerdel et al[17]	Portal thrombosis < 50% with or without minimal extension to the SMV	Portal thrombosis > 50% with or without minimal extension to the SMV	Complete portal and SMV thrombosis in its most proximal extent; preserved flow in the distal SMV	Complete portal and SMV thrombosis
Jamieson[19]	Partial or complete portal thrombosis up to the splenomesenteric junction	Portal thrombosis extending to the proximal SMV, with preserved mesenteric flow	Diffuse splanchnic system thrombosis with enlarged collateral vessels	Diffuse splanchnic system thrombosis with thin collaterals
Charco et al[18]	Thrombosis restricted to the portal vein, partial or complete	Thrombosis extending to the proximal SMV, with patency of the mesenteric confluence	Diffuse splanchnic system thrombosis with dilated collaterals	Diffuse splanchnic system thrombosis with thin collaterals

SMV: Superior mesenteric vein.