Intra-Abdominal Abscesses
Location | Etiology | Organisms |
|---|---|---|
Intraperitoneal | ||
Subphrenic Right or left lower quadrant Interloop Paracolic Pelvic | Postoperative; perforation of hollow viscus, appendicitis, diverticulitis, or tumor; Crohn disease; pelvic inflammatory disease; generalized peritonitis of any etiology | Bowel flora, often polymicrobial |
Retroperitoneal | ||
Pancreatic | Trauma, pancreatitis | Bowel flora, often polymicrobial |
Perinephric | Spread of renal parenchymal abscess (complication of pyelonephritis or rarely hematogenous from a remote source) | Aerobic gram-negative bacilli |
Visceral | ||
Hepatic | Trauma, ascending cholangitis, portal bacteremia | Aerobic gram-negative bacilli if origin is biliary Polymicrobial bowel flora Amebic infection via the portal venous system |
Splenic | Trauma, hematogenous, infarction (as in sickle cell disease and malaria) | Staphylococci, streptococci, anaerobes, aerobic gram-negative bacilli including Salmonella Candida in patients with immunocompromise |