The document discusses diseases of the biliary tract, including anatomy, investigations, classifications of gallstones, formation of gallstones, clinical features, diagnosis, and treatment. Key points are: 1) The Calot's triangle is an important area for dissection during cholecystectomy due to structures within it. 2) Ultrasound is a first-choice, non-invasive investigation for biliary tract diseases that can detect gallstones and duct dilation. 3) Cholesterol stones are now more common than pigment stones in China, and form due to supersaturation of bile with cholesterol. 4) Symptoms include biliary colic, and treatment is typically surgery for symptomatic or complicated

1. Disease of the Biliary Tract