<prompt> Most common cause of pyogenic liver abscess -DiverticulitisStricture of CBDSubdiaphragmatic abscessEmpyema in chest  <response>: Ans. is b i.e., Stricture of CBD Routes of infection to liverAlong the bile ducts MCStone impacted in CBDStricture of CBD - benign, malignantCryptogenicVia the portal veinVia the hepatic arteryBy direct extensionFrom a subdiaphragmatic abscessFrom an empyema in chestFrom suppuratative cholecystitisFrom perinephric abscessPenetrating or blunt traumaAlso knowo MC organisms Ref. Sabiston, SchwartzEscherichia coliKlebsiella pneumoniaAlso noteo Sabiston 18th ed. writes that now there are 2 most common cause of liver abscess i.e. Cryptogenic and infections from the biliary tree. It writes- Along with cryptogenic infections, infections from the biliary tree are presently the most common identifiable cause of hepatic abscess . 