Portal vein thrombosis (PVT) is a vascular disease of the liver that occurs when a blood clot occurs in the hepatic portal vein, which can lead to increased pressure in the portal vein system and reduced blood supply to the liver. The mortality rate is approximately 1 in 10
Slowed blood flow due to underlying cirrhosis or congestive heart failure is often implicated. The prevalence of PVT in patients with cirrhosis is unclear, with a wide variety of incidence claimed by various researchers (estimated to be 1 in 100 by some while others believe it affects nearly 1 in 4).
Treatment is aimed at opening the blocked veins to minimize complications; the duration of clot (acute versus chronic) affects treatment. Unless there are underlying reasons why it would be harmful, anticoagulation (low molecular weight heparin, followed by warfarin) is often initiated and maintained in patients who do not have cirrhosis. Anticoagulation for patients with cirrhosis who experience portal vein thrombosis is usually not advised unless they have chronic PVT 1) with thrombophilia, 2) with clot burden in the mesenteric veins, or 3) inadequate blood supply to the bowels. In more severe instances, shunts or a liver transplant may be considered. If blood flow to the gastrointestinal tract has been compromised chronically, surgery may be required to remove dead intestine.
The impact of PVT on the natural course of cirrhosis and prognosis is still debated. D'Amico et al  reported a more than threefold higher risk of failure to control active variceal bleeding in cirrhotic patients with PVT, irrespective of the use of endoscopic hemostasis or surgical shunting.
Portal vein thrombosis (PVT) is a blood clot of the portal vein, also known as the hepatic portal vein. This vein allows blood to flow from the intestines to the liver. A PVT blocks this blood flow. Although PVT is treatable, it can be life-threatening.
I don’t know you have PVT I just noted where they said you have a clot in your portal vein and the reduced size of one of your liver lobes on your ultrasound report