• 80% = cholesterol as major component
• pain usually poorly localised
• no systemic signs/symptoms
• lab Ix - normal
• USS preferred imaging modality, MRI if stone is thought to be in the duct (choledocholithiasis)

• well localised pain
• often with guarding, rebound tenderness, peritonism, fever, systemic signs
• up to 1/3 do not have leukocytosis

References include:
EMed cholelithiasis
https://www.bsg.org.uk/clinical-resource/gallstone-disease-diagnosis-and-management/