A pyogenic liver abscess is a type of liver abscess caused by bacteria. Pyogenic refers to the formation of pus that characterizes these liver abscesses.
E.g.: stones, cholangiocarcinoma
E.g.: diverticulitis, appendicitis, Crohn's disease
E.g.: penetrating injury, iatrogenic (radiofrequency ablation)
To differentiate pyogenic liver abscess from amoebic liver abscess, several features such as subjects with age more than 50 years with lungs involvement, multiple liver abscesses, with amoebic serologic titres less than 1:256 can help to pin down the diagnosis of pyogenic liver abscess.