Pyogenic Liver Abscess: Clinical Presentation, Diagnostic Evaluation, Management, and Outcome – A Case Report

Abstract

Pyogenic liver abscess (PLA) is a potentially life-threatening intra-abdominal infection characterized by the accumulation of pus within the liver parenchyma. Although advances in imaging, antimicrobial therapy, and interventional radiology have significantly improved outcomes, delayed diagnosis may lead to severe complications including sepsis, rupture, and multi-organ failure. Common causative organisms include Escherichia coli, Klebsiella pneumoniae, Streptococcus species, and anaerobic bacteria. Clinical presentation is often nonspecific, making early recognition challenging.

We present the case of a 52-year-old male who presented with fever, right upper quadrant abdominal pain, and generalized weakness. Laboratory investigations revealed leukocytosis and elevated inflammatory markers. Ultrasonography and contrast-enhanced computed tomography demonstrated a large pyogenic abscess in the right hepatic lobe. Blood cultures identified Klebsiella pneumoniae. The patient was successfully managed with intravenous antibiotics and ultrasound-guided percutaneous drainage, resulting in complete clinical recovery.

This case highlights the importance of prompt diagnosis, appropriate microbiological evaluation, imaging-guided intervention, and multidisciplinary management in achieving favorable outcomes in pyogenic liver abscess.

Introduction

Pyogenic liver abscess is the most common visceral abscess and represents a serious infectious condition requiring timely diagnosis and treatment. It occurs when bacteria invade the liver through the biliary tract, portal circulation, hepatic artery, direct extension from adjacent structures, or traumatic injury.

Predisposing factors include:

• Diabetes mellitus

• Biliary tract disease

• Cholangitis

• Intra-abdominal infections

• Immunosuppression

• Malignancy

• Liver trauma

Common pathogens include:

• Klebsiella pneumoniae

• Escherichia coli

• Streptococcus species

• Enterococcus species

• Anaerobic bacteria

Clinical manifestations often include fever, abdominal pain, malaise, anorexia, and weight loss. Because symptoms are frequently nonspecific, imaging studies play a critical role in establishing the diagnosis.

Early intervention is essential to prevent severe complications and mortality.

Case Report

Patient History

A 52-year-old male presented to the emergency department with complaints of:

• High-grade fever for 10 days

• Right upper abdominal pain for 1 week

• Loss of appetite

• Generalized weakness

• Intermittent chills and rigors

The abdominal pain was dull, continuous, and localized to the right hypochondrium.

The patient denied:

• Vomiting

• Jaundice

• Gastrointestinal bleeding

• Recent travel

• Tuberculosis exposure

Past medical history revealed:

• Type 2 diabetes mellitus for 8 years

• Hypertension for 5 years

There was no history of liver disease or alcohol abuse.

Clinical Examination

General Examination

• Blood pressure: 132/84 mmHg

• Pulse rate: 104/min

• Respiratory rate: 20/min

• Temperature: 101.8°F

• Oxygen saturation: 98% on room air

The patient appeared ill and mildly dehydrated.

Systemic Examination

Abdominal examination revealed:

• Right upper quadrant tenderness

• Mild hepatomegaly

• No guarding

• No rigidity

• No ascites

Cardiovascular and respiratory examinations were unremarkable.

Clinical Evaluation

Differential Diagnosis

The following conditions were considered:

• Pyogenic liver abscess

• Amoebic liver abscess

• Acute cholecystitis

• Hepatic malignancy

• Liver cyst infection

• Subphrenic abscess

The presence of fever, leukocytosis, and localized hepatic tenderness strongly suggested an infective hepatic process.

Investigations

Laboratory Evaluation

Routine investigations revealed:

• Hemoglobin: 11.8 g/dL

• Total leukocyte count: 17,600/mm³

• Platelet count: 328,000/mm³

• ESR: 58 mm/hr

• CRP: 142 mg/L

Liver function tests showed:

• Total bilirubin: 1.2 mg/dL

• AST: 72 U/L

• ALT: 68 U/L

• Alkaline phosphatase: 245 U/L

Blood glucose levels were elevated.

Blood Cultures

Blood cultures demonstrated:

• Klebsiella pneumoniae growth

• Sensitivity to ceftriaxone and piperacillin-tazobactam

Ultrasonography

Abdominal ultrasonography revealed:

• Hypoechoic lesion in the right hepatic lobe

• Size: 7.5 × 6.8 cm

• Internal echoes suggestive of pus collection

• Mild surrounding edema

Findings were highly suggestive of a liver abscess.

Contrast-Enhanced CT Scan

CT abdomen demonstrated:

• Solitary abscess cavity in segment VII

• Peripheral rim enhancement

• Central low-density necrotic content

• No rupture

• No intra-abdominal collections

Diagnosis

Based on clinical findings, laboratory investigations, imaging studies, and blood culture results, a diagnosis of: Pyogenic Liver Abscess Caused by Klebsiella pneumonia was established.

Management and Outcome

Initial Management

The patient was admitted and started on:

• Intravenous fluids

• Glycemic control

• Broad-spectrum intravenous antibiotics

• Supportive care

Empirical therapy included:

• Piperacillin-tazobactam

• Metronidazole

Antibiotics were later adjusted according to culture sensitivity.

Percutaneous Drainage

Because the abscess exceeded 5 cm in diameter, ultrasound-guided percutaneous catheter drainage was performed.

Approximately:

• 180 mL thick purulent material was aspirated.

Pus culture confirmed:

• Klebsiella pneumoniae

Hospital Course

At 72 Hours

• Fever subsided

• Pain improved

• Leukocyte count decreased

At 1 Week

• Significant clinical improvement

• Improved appetite

• Reduced inflammatory markers

At 2 Weeks

• Drain output minimal

• Follow-up imaging showed cavity reduction

Drain removal was performed successfully.

Follow-Up

At 1 Month

• Complete symptom resolution

• Normal inflammatory markers

• Improved glycemic control

At 3 Months

• No residual abscess

• Normal liver architecture

• Return to normal daily activities

Discussion

Pathophysiology

Pyogenic liver abscess develops when microorganisms invade hepatic tissue and trigger an inflammatory response leading to tissue necrosis and pus formation.

Routes of infection include:

• Biliary spread

• Portal venous spread

• Hematogenous dissemination

• Direct extension

• Traumatic inoculation

Diabetes mellitus significantly increases susceptibility to infection.

Epidemiology

Important epidemiological features include:

• More common in middle-aged adults

• Higher incidence in diabetic patients

• Increased prevalence in Asian populations

• Rising incidence of Klebsiella-associated abscesses

• Male predominance

Clinical Manifestations

Common symptoms include:

• Fever

• Chills

• Right upper quadrant pain

• Weight loss

• Anorexia

• Malaise

Advanced disease may result in:

• Sepsis

• Septic shock

• Abscess rupture

• Pleural complications

Diagnostic Considerations

Diagnosis relies on:

1. Clinical suspicion
2. Laboratory markers
3. Blood cultures
4. Ultrasonography
5. CT imaging
6. Microbiological evaluation

CT imaging remains the gold standard for defining abscess size, location, and complications.

Treatment Modalities

Medical Therapy

Small abscesses may respond to:

• Intravenous antibiotics

• Culture-guided therapy

Image-Guided Drainage

Recommended for:

• Abscesses >5 cm

• Persistent symptoms

• Failure of medical therapy

Surgical Intervention

Reserved for:

• Ruptured abscess

• Multiple complex collections

• Failure of percutaneous drainage

Complications

Potential complications include:

• Septicemia

• Rupture into the peritoneal cavity

• Pleural empyema

• Hepatic failure

• Multi-organ dysfunction

Prompt diagnosis significantly reduces morbidity and mortality.

Prognosis

Prognosis depends upon:

• Early diagnosis

• Organism virulence

• Abscess size

• Comorbid conditions

• Timeliness of drainage

Most patients experience excellent outcomes with modern antibiotic therapy and image-guided drainage.

Conclusion

Pyogenic liver abscess remains a potentially serious but treatable infectious disease. Careful clinical evaluation, timely imaging, microbiological identification, and appropriate drainage procedures are essential for successful management. This case demonstrates the effective treatment of a Klebsiella pneumoniae pyogenic liver abscess through early diagnosis, targeted antimicrobial therapy, and ultrasound-guided percutaneous drainage. Prompt recognition and multidisciplinary management remain crucial for preventing complications and ensuring favorable long-term outcomes.

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References

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