Liver Biopsy

Background and indications

Image-guided percutaneous liver biopsy involves obtaining a tissue sample for histological analysis. It is indicated for diagnosis and monitoring of diffuse liver diseases (chronic hepatitis, steatosis, hemochromatosis, autoimmune liver diseases) and characterization of focal liver lesions (suspicious nodules, tumors) requiring histological diagnosis.

Ultrasound or CT guidance allows precise needle positioning, minimizing risks and increasing diagnostic yield, particularly for small or difficult-to-access focal lesions.

Pre-procedure assessment

Assessment includes recent imaging (ultrasound, CT, or liver MRI), complete coagulation panel (PT/INR > 60%, platelets > 60,000/mm³), verification of anticoagulant and antiplatelet discontinuation per SIR/CIRSE guidelines, and blood typing. The puncture trajectory is planned to avoid vessels and dilated bile ducts.

Procedure

Under local anesthesia, a biopsy needle (16-18G, semi-automatic or automatic) is inserted via an intercostal or subcostal approach under ultrasound or CT guidance. For diffuse parenchymal biopsies, 2-3 cores (15-20 mm) are obtained. For focal lesions, the needle is positioned in the target lesion and 2-4 cores are obtained. The procedure takes 15 to 30 minutes. Tract cauterization may be performed on needle withdrawal for superficial lesions.

Results and scientific evidence

Image-guided liver biopsy offers a diagnostic yield of 90-98% for focal lesions and 95-100% for diffuse liver diseases. Diagnostic sensitivity for malignant lesions is 90-95% (Rockey et al., Hepatology, 2009; DOI: 10.1002/hep.22742). Major complication rate is below 1%.

Risks and complications

Transient local pain at puncture site (20-30%, treated with simple analgesics), bleeding (subcapsular or intraperitoneal hematoma: 1-2%, rarely requiring intervention), pneumothorax with high intercostal approach (< 1%), vasovagal reaction (< 1%). Tumor seeding along the needle tract is exceptional (< 0.01%) with modern needles.

Recovery

Monitoring for 2-4 hours after biopsy is required (blood pressure, pulse, pain assessment). Relative rest is recommended for 24 hours. Histological results are available within 5-10 business days.

Practical information

The procedure is performed as an outpatient or short inpatient stay depending on the case. It is performed by an interventional radiologist.