Hepatic Abscess Drainage

Background and indications

Image-guided percutaneous drainage is first-line treatment for liver abscesses > 5 cm or resistant to antibiotic therapy alone. Liver abscesses can be pyogenic (E. coli, Klebsiella, streptococci — most common in Western countries), amoebic (Entamoeba histolytica — tropical countries), or fungal (immunocompromised). Klebsiella abscess (invasive Klebsiella syndrome) is increasing and requires early drainage.

Pre-procedure assessment

Assessment includes contrast-enhanced hepatic CT (number, size, location, multilocular vs unilocular), blood cultures, serology (amebiasis if suspected), complete hepatic panel, and search for underlying cause (biliary obstruction, appendicitis, diverticulitis).

Procedure

Under local anesthesia and ultrasound (or CT) guidance, a pigtail drain (10-14F) is inserted into the abscess. Pus is aspirated and sent for bacteriology. For small abscesses (3-5 cm), simple fine needle aspiration may suffice. For multilocular abscesses, large-bore drain and lavage are needed. The procedure takes 20-30 minutes.

Results and scientific evidence

Percutaneous drainage combined with antibiotic therapy offers 85-95% cure rate for unilocular pyogenic abscesses. It is as effective as surgical drainage with lower morbidity. For amoebic abscesses, antibiotic therapy (metronidazole) alone often suffices, with drainage reserved for refractory cases or large size (> 10 cm).

Risks and complications

Transient bacteremia/sepsis (5-10%), hemorrhage (< 3%), reactive pleural effusion (5-10%), drain obstruction (10-15%, resolved by flushing or replacement). Mortality is 2-5%, related to underlying disease rather than the procedure.

Recovery

Drain maintained 7-14 days. IV then oral antibiotic therapy for 4-6 weeks. Control CT before drain removal.

Practical information

The procedure is performed as an inpatient. It is performed by an interventional radiologist, in coordination with the hepatologist and infectious disease specialist.