Non-Cirrhotic Portal Fibrosis (NCPF) and Splenomegaly

What is NCPF?

• Portal hypertension
• Patent hepatic and extrahepatic portal veins
• Absence of cirrhosis or a recognizable cause of cirrhosis
• Normal or near-normal liver function

Splenomegaly in NCPF - The Hallmark Feature

1. Massive splenomegaly
2. Pancytopenia (hypersplenism - thrombocytopenia, leukopenia, anaemia)
3. Absence of stigmata of liver dysfunction (no jaundice, no ascites at presentation, no palmar erythema, no spider naevi)

"Non-cirrhotic portal fibrosis, a condition common in tropical countries, is associated with massive splenomegaly and pancytopenia without stigmata of liver dysfunction."

• Bailey & Love's Short Practice of Surgery, 28th Ed.

Pathophysiology

• Obliterative portal venopathy and subendothelial thickening of intrahepatic portal veins cause increased resistance to portal blood flow
• The obstruction is presinusoidal, so sinusoidal (hepatic venous) pressure is relatively preserved - this explains why liver function remains normal
• Elevated portal pressure leads to congestion of the spleen, causing progressive splenomegaly
• Splenic enlargement results in sequestration and destruction of blood cells - this is hypersplenism, producing the characteristic pancytopenia

Histological Features

• Obliterative portal venopathy (obliteration of small intrahepatic portal vein branches)
• Nodular regenerative hyperplasia
• Periportal/perisinusoidal fibrosis
• Absence of true cirrhosis (bridging fibrosis, regenerative nodules)

Associated Conditions (Causes/Predisposing Factors)

1. Drugs and toxins: purine analogs (didanosine, azathioprine, 6-thioguanine), oxaliplatin
2. Immune disorders: connective tissue diseases, common variable immunodeficiency (CVID), HIV infection
3. Prothrombotic conditions: myeloproliferative disorders, antiphospholipid syndrome, protein S deficiency
4. Genetic disorders: Turner syndrome, telomerase disease, Adams-Oliver syndrome

50% of cases remain unexplained. The condition is particularly common in India (tropical countries), though its incidence appears to be declining.

Clinical Features

Investigations

• Endoscopy: Oesophageal/gastric varices
• Ultrasound + Doppler: Splenomegaly, patent portal and hepatic veins, no features of cirrhosis
• CT/MRI: Confirms splenomegaly, rules out portal vein thrombosis, may show periportal changes
• MR elastography: High spleen-to-liver stiffness ratio (distinguishes from cirrhosis)
• Liver biopsy: Confirms obliterative portal venopathy, absence of cirrhosis
• Fibroscan (transient elastography): Liver stiffness is typically LOW (distinguishing from cirrhosis)
• Blood counts: Pancytopenia from hypersplenism

Management

• Propranolol (beta-blocker) for prevention of recurrent variceal bleeding - controlled trials confirm efficacy in NCPF patients
• Endoscopic variceal band ligation / sclerotherapy
• TIPS or portosystemic shunts for refractory bleeding

• Splenectomy or partial splenic embolization (PSE) for severe symptomatic hypersplenism (severe pancytopenia)
• After splenectomy, there is an increased risk of glomerulonephritis (noted in Brenner & Rector's The Kidney - splenorenal shunt surgery also associated with increased GN incidence)

Key Distinguishing Points (Exam Focus)

• NCPF causes massive splenomegaly with preserved liver function - the classic differentiator from cirrhosis
• The pancytopenia is due to hypersplenism (sequestration), not bone marrow failure
• Variceal bleeding is well tolerated because hepatic reserve is maintained
• Liver biopsy shows obliterative portal venopathy, NOT cirrhosis
• Fibroscan shows low liver stiffness but high splenic stiffness

Cardiac Cirrhosis

Definition

• Harrison's Principles of Internal Medicine, 22nd Ed.

Pathophysiology - Step by Step

1. Right-sided heart failure → elevated venous pressure → transmitted via IVC and hepatic veins to hepatic sinusoids
2. Sinusoidal congestion and dilatation → sinusoidal edema → decreased oxygen delivery to hepatocytes
3. Centrilobular (Zone 3) hepatocyte ischemia and necrosis - Zone 3 is most vulnerable because it is furthest from the portal arterial supply and is directly adjacent to the hepatic venule; when left-sided failure co-exists (poor cardiac output), this hypoperfusion worsens the centrilobular necrosis
4. Mechanical force from sinusoidal distension + intravascular stasis → promotes intravascular microthrombi → localized ischemia → pericentral (centrilobular) fibrosis
5. With chronic and repeated insults, fibrosis progresses outward, eventually bridging between central veins (rather than between portal tracts) → "reverse lobulation"
6. End result: established cardiac cirrhosis

"Right-sided heart failure results in transmission of increased central venous pressure from the heart directly to the hepatic sinusoids. The result is centrilobular congestion and sinusoidal edema that further decrease oxygen delivery... The acute and chronic damage results in progressive centrilobular fibrosis."

• Sleisenger & Fordtran's GI and Liver Disease

Gross Pathology - "Nutmeg Liver"

• Central (centrilobular) areas appear dark red (congested, necrotic) and slightly depressed
• Surrounding parenchyma is tan/yellow (viable hepatocytes)
• The mottled pattern on cut surface resembles a cut nutmeg - hence the name

Histopathology

Causes of Cardiac Cirrhosis

• Right heart failure from any cause: ischemic cardiomyopathy, dilated cardiomyopathy
• Valvular disease: tricuspid regurgitation (pulsatile liver), mitral stenosis (raises pulmonary and right heart pressures)
• Constrictive pericarditis
• Pulmonary hypertension
• Congenital heart disease: particularly after the Fontan procedure (see below)

Clinical Features

• Hepatomegaly - often the most prominent finding; liver is firm and enlarged
• Pulsatile liver - specifically with tricuspid regurgitation (venous pulsations transmitted to liver)
• Hepatojugular reflux - JVP rises on pressing over the liver
• Dull RUQ pain - capsular distension from hepatomegaly
• Ascites - high serum-ascites albumin gradient (SAAG >1.1 g/dL), high protein concentration (>2.5 g/dL) - distinguishing it from portal hypertensive ascites from cirrhosis
• Jaundice - mild; seen in <10% of patients, typically with severe/acute heart failure
• Peripheral edema and pleural effusions - from heart failure itself
• Splenomegaly - from portal hypertension (congestive splenomegaly)
• Spider telangiectasias and varices - usually NOT present; variceal bleeding does not occur from congestive hepatopathy alone

Laboratory Findings

"ALP levels are characteristically elevated, and aminotransferases may be normal or slightly increased, with AST usually higher than ALT."

• Harrison's, 22nd Ed.

Imaging

• Ultrasound: Hepatomegaly, ascites, dilated IVC and hepatic veins (key finding), splenomegaly
• CT with contrast: Inhomogeneous hepatic enhancement during portal phase; dilated hepatic veins and IVC; hepatomegaly
• Doppler US: May detect pulsatile hepatic vein flow in tricuspid regurgitation

Differentiation from Other Conditions

Fontan-Associated Liver Disease (FALD)

• Progressive liver fibrosis and cirrhosis
• Portal hypertension - oesophageal varices in ~20-50% of older Fontan patients
• Hepatocellular carcinoma (HCC) - a recognized long-term risk
• Combined heart-liver transplantation may be required in advanced cases

• Fuster & Hurst's The Heart, 15th Ed.

Treatment

• Primary treatment: Optimise the underlying cardiac disease (diuretics, ACE inhibitors, cardiac resynchronisation, valve repair/replacement, heart transplantation)
• Liver function tests improve with effective cardiac therapy
• Paracentesis for tense ascites when needed
• Variceal bleeding prophylaxis if varices develop (uncommon in pure congestive hepatopathy)
• In FALD with end-stage liver disease: consider combined heart-liver transplantation

"The presence of congestive hepatopathy does not affect the prognosis in patients with heart failure; the mortality rate is determined primarily by the severity of the underlying cardiac disease."

• Sleisenger & Fordtran's GI and Liver Disease

Key Exam Points

1. Cardiac cirrhosis is due to right heart failure - the raised CVP is transmitted to hepatic sinusoids
2. Fibrosis bridges central vein to central vein - "reverse lobulation" - not portal to portal (as in typical cirrhosis)
3. Grossly = "nutmeg liver"; histologically = bland, no inflammation, dilated sinusoids
4. Pulsatile liver = tricuspid regurgitation
5. Ascites has high SAAG + high protein
6. Prothrombin time prolonged and vitamin K resistant
7. Variceal bleeding is uncommon; distinguish from Budd-Chiari by absence of RBC extravasation on biopsy
8. Fontan procedure patients are an important emerging group at risk for FALD and HCC