Last reviewed: June 2020
Last updated: April  2020

Summary

Definition

History and exam

Key diagnostic factors

  • presence of risk factors
  • fevers and chills
  • RUQ tenderness
  • hepatomegaly

Other diagnostic factors

  • weight loss
  • fatigue
  • abdominal pain
  • nausea and vomiting
  • cough, shortness of breath, or chest pain
  • jaundice
  • signs of pleural effusion in the right lower zone
  • signs of shock
  • ascites

Risk factors

  • biliary tract disease
  • age >50 years
  • underlying malignancy
  • diabetes mellitus
  • interventional biliary or hepatic procedures
  • living in or visiting area endemic for amoebiasis
  • cirrhosis
  • liver transplantation
  • alcoholism
  • male sex
  • cardiopulmonary disease
  • immunocompromised state
  • penetrating abdominal trauma
  • inflammatory bowel disease, pancreatitis, appendicitis, diverticulitis, or peritonitis
  • bacteraemia, endocarditis, or other intravascular infection

Diagnostic investigations

1st investigations to order

  • FBC
  • serum LFTs
  • blood cultures
  • prothrombin time and activated partial thromboplastin time
  • liver ultrasound
  • contrast-enhanced abdominal CT scan
  • Gram stain and culture of aspirated abscess fluid
More 1st investigations to order

Investigations to consider

  • CXR
  • serum antibody test for Entamoeba histolytica
  • stool Entamoeba histolytica antigen detection test
  • antigen testing or polymerase chain reaction (PCR) of aspirated abscess fluid
  • liver MRI
  • CRP
More investigations to consider

Treatment algorithm

Contributors

Assistant Professor of Medicine

Section of Infectious Diseases

Boston University

Boston

MA

Disclosures

RPS declares that she has no competing interests.

Professor of Medicine

Harvard Medical School and Tufts University School of Medicine

Boston

MA

Disclosures

LSF has received royalties from Elsevier, Wiley, McGraw-Hill, and UpToDate, and has received honoraria from the American Board of Internal Medicine.

Peer reviewersVIEW ALL

Consultant Physician

Liver Unit

Queen Elizabeth Hospital

Birmingham

UK

Disclosures

JN declares that he has no competing interests.

Assistant Professor of Medicine

University of Chicago

Center for Liver Disease

Chicago

IL

Disclosures

NR declares that she has no competing interests.

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