Portal hypertension
Portal hypertension is defined as hepatic venous pressure gradient (HVPG) greater than 5 mmHg. HVPG is a surrogate for the portosystemic pressure gradient. Clinically significant portal hypertension is defined as a gradient greater than 10 mmHg and variceal bleeding may occur at a gradient greater than 12 mmHg.
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Pathology
Causes can be split by their relation to the hepatic sinusoids 7:
Prehepatic causes
- portal vein thrombosis
- extrinsic compression of portal vein
- congenital portal vein stenosis
- arteriovenous fistula
- SVC obstruction (downhill varices)
Hepatic / sinusoidal causes
- cirrhosis
- viral hepatitis
- Schistosomiasis (S. mansoni or S. japonicum)
- congenital hepatic fibrosis
- infiltrative liver diseases
- polycystic liver disease
- nodular regenerative hyperplasia
- idiopathic portal hypertension
Posthepatic causes
- Budd-Chiari syndrome
- sinusoidal obstruction syndrome
- congestive cardiac failure
- constrictive pericarditis
Subtypes
Radiographic features
Ultrasound
- dilated portal vein (>13 mm): non-specific
- biphasic or reverse flow in portal vein (late stage): pathognomonic
- recanalization of paraumbilical vein: pathognomonic
- portal-systemic collateral pathways (collateral vessels/varices)
- splenomegaly
- ascites
- cause of portal hypertension often identified, most commonly cirrhosis
CT and MRI
- dilated portal vein +/- mesenteric veins
- contrast enhancement of paraumbilical vein: pathognomonic
- collateral vessels/varices: these are many and can include 4
- coronary venous collaterals: considered one of the commonest 4
- esophageal collaterals
- paraumbilical collaterals
- abdominal wall collaterals
- perisplenic collaterals
- retrogastric collaterals
- paraesophageal collaterals
- omental collaterals
- retroperitoneal collaterals
- mesenteric collaterals
- splenorenal collaterals
- gastrorenal collaterals
- splenomegaly
- ascites
- cause of portal hypertension often identified, most commonly liver cirrhosis
Treatment and prognosis
Management ultimately depends on the underlying etiology and the associated complications. Generally, management options include:
- lifestyle modifications: dietary sodium restriction (e.g. for ascites)
- medications: propranolol (e.g. for varices), diuretics (e.g. for ascites)
- interventional procedures
- creation of shunts: transjugular intrahepatic portosystemic shunt (TIPS), surgical portosystemic shunt, surgical splenorenal shunt
- balloon dilatation of hepatic vein (e.g. for thrombosis/web in hepatic vein)
- transhepatic clot thrombolysis (e.g. for portal vein thrombosis)
- splenic artery embolization 3
- liver transplantation
Complications
- ascites
-
esophageal varices and gastric varices
- variceal bleeding (30-50% mortality with each bleed)
- portal hypertensive gastropathy/enteropathy/colopathy
- hepatic encephalopathy
- hepatorenal syndrome
- hepatopulmonary syndrome
- congestive splenomegaly and hypersplenism
Differential diagnosis
Dilatation of splenic veins at the splenic hilum without splenomegaly may occur in situations such as state of increased perfusion of splenic tissue associated with an immune response 6.
Related Radiopaedia articles
Hepatobiliary pathology
- depositional disorders
- infection and inflammation
- liver abscess
- hepatic hydatid infection
- cirrhosis
- hepatitis
- cholecystitis
- cholangitis
- malignancy
- liver and intrahepatic bile duct tumors
- benign epithelial tumors
- hepatocellular hyperplasia
- hepatocellular adenoma
- hepatic/biliary cysts
- benign nonepithelial tumors
- primary malignant epithelial tumors
- hepatocellular carcinoma
- hepatocellular carcinoma variants
-
cholangiocarcinoma
- intra-hepatic
- mass-forming type
- periductal infiltrating type - Klatskin tumors
- intraductal growing type
- extra-hepatic/large duct type
- intra-hepatic
- biliary cystadenocarcinoma
- combined hepatocellular and cholangiocarcinoma
- hepatoblastoma
- undifferentiated carcinoma
- primary malignant nonepithelial tumors
- hematopoietic and lymphoid tumors
- primary hepatic lymphoma
- hepatic myeloid sarcoma (hepatic chloroma)
- secondary tumors
- miscellaneous
- adrenal rest tumors
- hepatic carcinosarcoma
- hepatic fibroma
- hepatic Kaposi sarcoma
- hepatic lipoma
- hepatic mesenchymal hamartoma
- hepatic myxoma
- hepatic rhabdoid tumor
- hepatic solitary fibrous tumor
- hepatic teratoma
- hepatic yolk sac tumor
- inflammatory myofibroblastic tumor (inflammatory pseudotumor)
- nodular regenerative hyperplasia
- pancreatic rest tumors
- primary hepatic carcinoid
- benign epithelial tumors
- liver and intrahepatic bile duct tumors
- metabolic
- trauma
-
vascular and perfusion disorders
- portal vein related
- hepatic artery related
- hepatic veins related
- inferior vena cava related
- other
- third inflow
- liver thrombotic angiitis
- infra diaphragmatic total anomalous pulmonary venous return (TAPVR)
- hereditary hemorrhagic telangiectasia (Osler-Weber-Rendu disease)