Treatments exist:
They require the cooperation of experts in several disciplines : specialized labs, hematologists, radiologists, hepatic surgeons, anesthetists, resuscitation specialists and of course hepatologists.
The first step is to:
(a) assess the specific treatment of the causes when they are known;
(b) to administer anticoagulants;
(c) to treat severe manifestations (ascites, kidney failure, infections, digestive hemorrhage)
Nowadays, these treatments are well recognised in liver and gastroenterology units.
The second step is to make the thrombosed veins patent again, once and for all (angioplasty of the hepatic veins or of the vena cava).
In case it fails, the third option is to make a derivation between the portal and the cava systems. This is currently what is done using TIPS. (This technique is far less invasive than surgery).
In case this fails as well, a hepatic transplant must be envisaged.
Thanks to these different treatments, there have been constant improvements in the last thirty years.
Some diseases which were potentially fatal after a few months or years have now become non visible in 85 % of the cases. This is the result of continuous treatment and regular checkups.