Diseases of the Liver and Biliary Tract

Anatomic Patterns

Anatomic injury refers to the physical changes seen in the liver tissue:

1. Inflammation: Known as hepatitis.
2. Degeneration: This can manifest as hydropic (water-filled) or fatty degeneration.
3. Fibrosis: The development of scar tissue, which can progress to cirrhosis.

Functional Patterns

Functional injury refers to the clinical manifestations resulting from the loss of liver capacity:

1. Jaundice: A yellowing of the skin and eyes caused by the failure to excrete bilirubin.
2. Cholestasis: The obstruction of bile flow.
3. Hepatic Failure: The total loss of the liver's metabolic and synthetic capabilities.
4. Ascites: The accumulation of fluid in the abdominal cavity.

Exam Tip: If a question asks about the physical change in the liver, look for anatomic terms like "fibrosis" or "inflammation." If it asks about the clinical presentation (what the patient looks like), look for functional terms like "jaundice" or "ascites."

Major Consequences of Liver Disease

When liver function is compromised, the body suffers from several "toxic accumulations" and metabolic failures:

• Accumulation of Waste: Metabolic wastes, specifically ammonia and bilirubin, build up in the blood. High ammonia levels can lead to hepatic encephalopathy, a state of cognitive dysfunction.
• Nutritional Deficiencies: A lack of bile acid excretion leads to the failure to absorb intestinal fats.
• Circulatory and Fluid Issues: Patients may experience bleeding (due to lack of clotting factors) and edema.

Common Liver Pathologies

Viral Hepatitis and Cirrhosis

Viral hepatitis is a common contagious disease. The different types (A through E) vary based on their mode of transmission, incubation period, and the risk of developing hepatocellular carcinoma.

Cirrhosis represents the final end-point for many chronic liver diseases. It is characterized by extensive fibrosis and the disruption of normal liver architecture, which often leads to portal hypertension—increased pressure within the portal venous system.

Alcoholic Liver Disease

Chronic alcohol consumption is a major cause of liver damage, contributing to the progression of inflammation and eventually cirrhosis.

Gallbladder and Biliary Diseases

The biliary tract is also susceptible to disease, most notably through the formation of gallbladder stones.

• Cholesterol stones: These account for approximately 80% of cases.
• Pigment stones: These are composed of bilirubin.

These stones may obstruct the bile duct, leading to cholecystitis (inflammation of the gallbladder).