Recommended standardized nomenclature for description of PVT in both the clinical and research setting

Descriptor	Definition
Time course
Recent	PVT presumed to be present for <6 months
Chronic	PVT present or persistent for >6 months
Percent occlusion of main PV
Completely occlusive	No persistent lumen
Partially occlusive	Clot obstructing >50% of original vessel lumen
Minimally occlusive	Clot obstructing <50% of original vessel lumen
Cavernous transformation	Gross portoportal collaterals without original PV seen
Response to treatment or interval change
Progressive	Thrombus increases in size or progresses to more complete occlusion
Stable	No appreciable change in size or occlusion
Regressive	Thrombus decreases in size or degree of occlusion

Reproduced with permission from Wolters Kluwer Health, Inc.: Northup PG, Garcia-Pagan JC, Garcia-Tsao G, et al. Vascular liver disorders, portal vein, thrombosis, and procedural bleeding in patient with liver disease: 2020 practice guidance by the American Association for the Study of Liver Diseases. Hepatology 2021; 73(1):366-413. Copyright © 2020 American Association for the Study of Liver Diseases. https://journals.lww.com/hep/pages/default.aspx.

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Recommended standardized nomenclature for description of PVT in both the clinical and research setting