Episode one of the Biliary Tract Disease chapter starts with the stone, because the phenotype tells you what biochemical environment produced it, and that environment is really the risk-factor list seen from the mechanism side. Cholesterol stones come from supersaturation, dysmotility, or nucleation; black pigment stones from excess unconjugated bilirubin; brown pigment stones form new in the duct under stasis plus bacterial deconjugation. Asymptomatic stones are observed because the math favors it, unless a cancer or surgical-emergency configuration shifts the calculus, and true biliary colic tips a fit patient toward cholecystectomy. When persistent obstruction converts colic into acute cholecystitis, the Tokyo grade dictates how aggressively to operate, with the friable ischemic wall of the acalculous and emphysematous variants pushing drainage back toward the percutaneous route. Topics covered Cholesterol stones and the three lithogenic pathways Gallstone risk factors mapped to mechanism Black pigment stones and chronic hemolysis Brown pigment stones and the two-year rule Observation versus surgery for asymptomatic stones Prophylactic cholecystectomy indications Tokyo diagnosis and grading of cholecystitis Drainage options for the poor surgical candidate Acalculous and emphysematous variants Key decisions Asymptomatic gallstones are observed because progression to symptomatic disease runs only one to four percent per year, which does not exceed the perioperative mortality of elective cholecystectomy. Prophylactic cholecystectomy is offered for a discrete list of cancer or emergency configurations: patchy porcelain gallbladder, stones three centimeters or larger, coexisting polyps, Native American women with stones, and pancreaticobiliary maljunction with cysts. In uncomplicated cholecystitis liver chemistries stay normal or under twice normal, so a marked bilirubin or transaminase elevation signals concurrent duct stones or Mirizzi syndrome and should widen the differential. Tokyo grade one mild disease gets early laparoscopic cholecystectomy within the admission, usually within seven days, while the planes of Calot's triangle still separate. Tokyo grade three severe disease with organ dysfunction gets ICU resuscitation plus emergent gallbladder drainage first, with cholecystectomy deferred and sometimes never done. For the poor surgical candidate, endoscopic-ultrasound-guided drainage with a lumen-apposing metal stent is now preferred over percutaneous drainage, but emphysematous cholecystitis is a contraindication because the ischemic friable wall risks catastrophic perforation. Acalculous and emphysematous variants prioritize rapid percutaneous cholecystostomy with broad-spectrum antibiotics, and gangrene, perforation, or peritonitis forces operation regardless of stability. For the full chapter with MCQs, tables, and primary-guideline references, visit www.boardpearls.com. Questions or feedback: [email protected].

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“What did the council decide on item 42?” — answered with the speaker and the moment.

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