Explore autoimmune hepatic and biliary disorders in this comprehensive lecture from the UCLA Mellinkoff Gastroenterology and Hepatology Symposium. Delve into autoimmune hepatitis, covering its polygenic nature, clinical presentation, diagnosis methods, and treatment options. Examine serological markers, scoring systems, and treatment endpoints. Investigate the concept of overlap syndromes, comparing IgG-related conditions with Primary Sclerosing Cholangitis (PSC). Learn about histological features, IgG ratios, and the clinical presentation of IgG-related disorders. Understand the differences between IgG and PSC, including treatment approaches and the use of steroids. Gain valuable insights into these complex autoimmune conditions affecting the liver and biliary system.