Liver Abscess

Liver Abscess

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Bacterial abscess of the liver is relatively rare; however, it has been described since the time of Hippocrates (400 BCE), with the first published review by Bright appearing in 1936. In 1938, Ochsner’s classic review heralded surgical drainage as the definitive therapy; however, despite the more aggressive approach to treatment, the mortality remained at 60-80%. [1]

The development of new radiologic techniques, the improvement in microbiologic identification, and the advancement of drainage techniques, as well as improved supportive care, have reduced mortality to 5-30%; yet, the prevalence of liver abscess has remained relatively unchanged. Untreated, this infection remains uniformly fatal.

The three major forms of liver abscess, classified by etiology, are as follows:

For patient education resources, see the Infections Center and the Digestive Disorders Center, as well as Skin Abscess and Antibiotics.

The liver receives blood from both systemic and portal circulations. Increased susceptibility to infections would be expected given the increased exposure to bacteria. However, Kupffer cells lining the hepatic sinusoids clear bacteria so efficiently that infection rarely occurs. Multiple processes have been associated with the development of hepatic abscesses (see the image below).

Appendicitis was traditionally the major cause of liver abscess. As diagnosis and treatment of this condition has advanced, its frequency as a cause for liver abscess has decreased to 10%.

Biliary tract disease is now the most common source of pyogenic liver abscess (PLA). Obstruction of bile flow allows for bacterial proliferation. Biliary stone disease, obstructive malignancy affecting the biliary tree, stricture, and congenital diseases are common inciting conditions. With a biliary source, abscesses usually are multiple, unless they are associated with surgical interventions or indwelling biliary stents. In these instances, solitary lesions can be seen.

Infections in organs in the portal bed can result in a localized septic thrombophlebitis, which can lead to liver abscess. Septic emboli are released into the portal circulation, trapped by the hepatic sinusoids, and become the nidus for microabscess formation. These microabscesses initially are multiple but usually coalesce into a solitary lesion.

Microabscess formation can also be due to hematogenous dissemination of organisms in association with systemic bacteremia, such as endocarditis and pyelonephritis. Cases also are reported in children with underlying defects in immunity, such as chronic granulomatous disease and leukemia.

Approximately 4% of liver abscesses result from fistula formation between local intra-abdominal infections.

Despite advances in diagnostic imaging, cryptogenic causes account for a significant proportion of cases; surgical exploration has impacted this minimally. These lesions usually are solitary in nature.

Penetrating hepatic trauma can inoculate organisms directly into the liver parenchyma, resulting in pyogenic liver abscess. Nonpenetrating trauma can also be the precursor to pyogenic liver abscess by causing localized hepatic necrosis, intrahepatic hemorrhage, and bile leakage. The resulting tissue environment permits bacterial growth, which may lead to pyogenic liver abscess. These lesions are typically solitary.

PLA has been reported as a secondary infection of amebic abscess, hydatid cystic cavities, and metastatic and primary hepatic tumors. It is also a known complication of liver transplantation, hepatic artery embolization in the treatment of hepatocellular carcinoma, and the ingestion of foreign bodies, which penetrate the liver parenchyma. Trauma and secondarily infected liver pathology account for a small percentage of liver abscess cases.

The right hepatic lobe is affected more often than the left hepatic lobe by a factor of 2:1. Bilateral involvement is seen in 5% of cases. The predilection for the right hepatic lobe can be attributed to anatomic considerations. The right hepatic lobe receives blood from both the superior mesenteric and portal veins, whereas the left hepatic lobe receives inferior mesenteric and splenic drainage. It also contains a denser network of biliary canaliculi and, overall, accounts for more hepatic mass. Studies have suggested that a streaming effect in the portal circulation is causative.

Polymicrobial involvement is common, with Escherichia coli and Klebsiella pneumoniae being the two most frequently isolated pathogens (see the image below). Reports suggest that K pneumoniae is an increasingly prominent cause. [3]

Enterobacteriaceae are especially prominent when the infection is of biliary origin. Abscesses involving K pneumoniae have been associated with multiple cases of endophthalmitis.

The pathogenic role of anaerobes was underappreciated until the isolation of anaerobes from 45% of cases of pyogenic liver abscess was reported in 1974. Since that time, increasing rates of anaerobic involvement have been reported, likely because of increased awareness and improved culturing techniques. The most frequently encountered anaerobes are Bacteroides species, Fusobacterium species, and microaerophilic and anaerobic streptococci. A colonic source is usually the initial source of infection.

Staphylococcus aureus abscesses usually result from hematogenous spread of organisms involved with distant infections, such as endocarditis. S milleri is neither anaerobic nor microaerophilic. It has been associated with both monomicrobial and polymicrobial abscesses in patients with Crohn disease, as well as with other patients with pyogenic liver abscess.

Amebic liver abscess is most often due to E histolytica. Liver abscess is the most common extraintestinal manifestation of this infection.

Fungal abscesses primarily are due to Candida albicans and occur in individuals with prolonged exposure to antimicrobials, hematologic malignancies, solid-organ transplants, and congenital and acquired immunodeficiency. Cases involving Aspergillus species have been reported.

Other organisms reported in the literature include Actinomyces species, Eikenella corrodens, Yersinia enterocolitica, Salmonella typhi, and Brucella melitensis.

A small case series in Taiwan investigated pyogenic liver abscess as the initial manifestation of underlying hepatocellular carcinoma. In regions with a high prevalence of both pyogenic liver abscess and hepatocellular carcinoma, clinicians should be aware of the possibility of underlying hepatocellular carcinoma in patients with risk factors for the disease. [4]

The incidence of pyogenic liver abscess has essentially remained unchanged by both hospital and autopsy data. Liver abscess was diagnosed in 0.7%, 0.45%, and 0.57% of autopsies during the periods of 1896-1933, 1934-1958, and 1959-1968, respectively. The frequency in hospitalized patients is in the range of 8-16 cases per 100,000 persons. Studies suggest a small, but significant, increase in the frequency of liver abscess.

Prior to the antibiotic era, liver abscess was most common in the fourth and fifth decades of life, primarily due to complications of appendicitis. With the development of better diagnostic techniques, early antibiotic administration, and the improved survival of the general population, the demographic has shifted toward the sixth and seventh decades of life. Frequency curves display a small peak in the neonatal period followed by a gradual rise beginning at the sixth decade of life.

Cases of liver abscesses in infants have been associated with umbilical vein catheterization and sepsis.

When abscesses are seen in children and adolescents, underlying immune deficiency, severe malnutrition, or trauma frequently exists.

While abscesses once showed a predilection for males in earlier decades, no sexual predilection currently exists. Males have a poorer prognosis from hepatic abscess than females.

Untreated, pyogenic liver abscess remains uniformly fatal. With timely administration of antibiotics and drainage procedures, mortality currently occurs in 5-30% of cases. The most common causes of death include sepsis, multiorgan failure, and hepatic failure. [5]

Indicators of a poor prognosis have been described since 1938 and include multiplicity of abscesses, underlying malignancy, severity of underlying medical conditions, presence of complications, and delay in diagnosis. [5]

Indicators of a poor prognosis in amebic abscess include a bilirubin level of greater than 3.5 mg/dL, encephalopathy, hypoalbuminemia (ie, serum albumin level of

An underlying malignant etiology and an Acute Physiology and Chronic Health Evaluation (APACHE II) score greater than 9 increases the relative mortality by 6.3-fold and 6.8-fold, respectively.

Chen et al examined prognostic factors for elderly patients with pyogenic liver abscess. [6] Results from the study, which included 118 patients aged 65 years or older and 221 patients below age 65 years, indicated that age and an APACHE II score of 15 or greater at hospital admission were risk factors for mortality. The evidence ultimately suggested that outcomes for older patients with pyogenic liver abscess are on a par with those for younger patients. The investigators also found that in the younger patient group, there was greater frequency of males suffering from alcoholism, a cryptogenic abscess, and K pneumoniae infection.

Ochsner A, DeBakey M, Murray S. Pyogenic Abscess of the Liver II. An Analysis of Forty-Seven Cases with Review of the Literature. Am J Surg. 1938. XL:292-319.

Othman N, Mohamed Z, Yahya MM, Leow VM, Lim BH, Noordin R. Entamoeba histolytica antigenic protein detected in pus aspirates from patients with amoebic liver abscess. Exp Parasitol. 2013 Aug. 134 (4):504-10. [Medline].

Brisse S, Fevre C, Passet V, Issenhuth-Jeanjean S, Tournebize R, Diancourt L, et al. Virulent clones of Klebsiella pneumoniae: identification and evolutionary scenario based on genomic and phenotypic characterization. PLoS One. 2009. 4 (3):e4982. [Medline]. [Full Text].

Lin YT, Liu CJ, Chen TJ, Chen TL, Yeh YC, Wu HS, et al. Pyogenic liver abscess as the initial manifestation of underlying hepatocellular carcinoma. Am J Med. 2011 Dec. 124 (12):1158-64. [Medline].

Chen SC, Huang CC, Tsai SJ, Yen CH, Lin DB, Wang PH, et al. Severity of disease as main predictor for mortality in patients with pyogenic liver abscess. Am J Surg. 2009 Aug. 198 (2):164-72. [Medline].

Chen SC, Lee YT, Yen CH, Lai KC, Jeng LB, Lin DB, et al. Pyogenic liver abscess in the elderly: clinical features, outcomes and prognostic factors. Age Ageing. 2009 May. 38 (3):271-6; discussion. [Medline].

Alsaif HS, Venkatesh SK, Chan DS, Archuleta S. CT appearance of pyogenic liver abscesses caused by Klebsiella pneumoniae. Radiology. 2011 Jul. 260 (1):129-38. [Medline].

Fontanilla T, Noblejas A, Cortes C, Minaya J, Mendez S, Van den Brule E, et al. Contrast-enhanced ultrasound of liver lesions related to arterial thrombosis in adult liver transplantation. J Clin Ultrasound. 2013 Oct. 41 (8):493-500. [Medline].

Cavailloles FA, Mure A, Nasser H, Lecapitaine AL, Granier F. Multiple liver amoebic abscesses detected on FDG PET/CT. Clin Nucl Med. 2014 Jan. 39 (1):79-80. [Medline].

Ruben Peralta, MD, FACS Professor of Surgery, Anesthesia and Emergency Medicine, Senior Medical Advisor, Board of Directors, Program Chief of Trauma, Emergency and Critical Care, Consulting Staff, Professor Juan Bosch Trauma Hospital, Dominican Republic

Ruben Peralta, MD, FACS is a member of the following medical societies: American Association of Blood Banks, American College of Surgeons, American Medical Association, Association for Academic Surgery, Massachusetts Medical Society, Society of Critical Care Medicine, Society of Laparoendoscopic Surgeons, Eastern Association for the Surgery of Trauma, American College of Healthcare Executives

Disclosure: Nothing to disclose.

Michelle V Lisgaris, MD Assistant Professor of Medicine, Case Western Reserve University School of Medicine

Michelle V Lisgaris, MD is a member of the following medical societies: American College of Physicians, American Medical Association, Infectious Diseases Society of America, Society for Healthcare Epidemiology of America

Disclosure: Nothing to disclose.

Robert A Salata, MD Chief and Clinical Program Director of Division of Infectious Diseases, Vice Chair for International Affairs, Professor, Department of Medicine, Case Western Reserve University School of Medicine

Robert A Salata, MD is a member of the following medical societies: American Association of Immunologists, American Federation for Medical Research, American Medical Association, Central Society for Clinical and Translational Research, Infectious Diseases Society of America, Ohio State Medical Association, Society for Healthcare Epidemiology of America

Disclosure: Nothing to disclose.

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Received salary from Medscape for employment. for: Medscape.

Joseph F John, Jr, MD, FACP, FIDSA, FSHEA Clinical Professor of Medicine, Molecular Genetics and Microbiology, Medical University of South Carolina College of Medicine; Associate Chief of Staff for Education, Ralph H Johnson Veterans Affairs Medical Center

Joseph F John, Jr, MD, FACP, FIDSA, FSHEA is a member of the following medical societies: Charleston County Medical Association, Infectious Diseases Society of America, South Carolina Infectious Diseases Society

Disclosure: Nothing to disclose.

John Geibel, MD, DSc, MSc, AGAF Vice Chair and Professor, Department of Surgery, Section of Gastrointestinal Medicine, Professor, Department of Cellular and Molecular Physiology, Yale University School of Medicine; Director of Surgical Research, Department of Surgery, Yale-New Haven Hospital; American Gastroenterological Association Fellow

John Geibel, MD, DSc, MSc, AGAF is a member of the following medical societies: American Gastroenterological Association, American Physiological Society, American Society of Nephrology, Association for Academic Surgery, International Society of Nephrology, New York Academy of Sciences, Society for Surgery of the Alimentary Tract

Disclosure: Nothing to disclose.

Marco G Patti, MD Professor of Surgery, Director, Center for Esophageal Diseases, University of Chicago Pritzker School of Medicine

Marco G Patti, MD is a member of the following medical societies: American Association for the Advancement of Science, American Surgical Association, American College of Surgeons, American Gastroenterological Association, American Medical Association, Association for Academic Surgery, Pan-Pacific Surgical Association, Society for Surgery of the Alimentary Tract, Society of American Gastrointestinal and Endoscopic Surgeons, Southwestern Surgical Congress, Western Surgical Association

Disclosure: Nothing to disclose.

Liver Abscess

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