Fever, RUQ pain and pus in the liver on CT or US.
Most occur from underlying biliary disease of any kind, other causes include downstream from colon pathology (esp appendicitis), hematogenous, and bad luck. Candida and other fungi can occur in the neutropenic and will manifest as post-leukocytosis and fever see neutropenic fever
AIDS: Bartonella (aka cat scratch disease).
Drain the pus plus antibiotics if bacterial, antibiotics alone if amoebic, if Candida, probably lipid based amphotericin.
I prefer a third generation cephalosporins PLUS metronidazole. Alternatives include a carbapenam alone OR penicillin/beta-lactamase inhibitors alone OR a quinolone PLUS metronidazole. In place of metronidazole, clindamycin can be used.
ICD9 Codes (Soon to be supplanted by ICD10)
liver 572.0; amebic 006.3.