BACKGROUND AND AIMS: Despite the undeniable ongoing development of cross-sectional imaging methods, not all focal liver lesions (FLLs) have a typical pattern. An image-guided biopsy using a percutaneous approach might safely provide a final histological diagnosis of the FLLs. We aimed to evaluate the accuracy, efficiency, complication rate, technical features, and relationships between the followed parameters of computed tomography (CT)-guided percutaneous biopsies of FLLs using a retrospective approach. METHODS: 303 percutaneous biopsy procedures in 295 patients were carried out in patients with suspected or indeterminate FLLs over a 10-year period. The median size of the tumors was 44 mm (15 - 144 mm). Median age of patients was 67 years (25 to 87 years). Skin-to-lesion distance was variable, from 30 mm to 138 mm (median length 59 mm). In 200 procedures (66%) malignant disease was known from the patients ́ clinical history. RESULTS: In 288 biopsies (95%) the results were true positive or true negative; 15 procedures (4.95%) resulted in a histologically false negative and had to be confirmed using other approaches. Metastatic disease to hepatic parenchyma of various origins was the most frequent histological diagnosis (55.4%). Cholangiocarcinoma was the most common individual result (13.5%). In total 14 complications (4.6%) were confirmed, 4 of which were severe haemorrhages that needed angiographic treatment and in one case surgical revision. The mortality rate in our group was 0.3%. A statistically significant relationship between lesion size and diagnostic accuracy (p < 0.01) was revealed. The use of a 16 G needle calibre and at least two samples were suitable for hypo- and hypervascular lesions without a significant increase in the complication rate. CONCLUSIONS: Core needle biopsy using a percutaneous approach and a CT-guidance performed on patients with indetermined FLLs had a high overall accuracy in determining the final histological diagnosis including subtyping. Concurrently, the complication incidence was low.

2nd Department of Internal Medicine Gastroenterology Charles University Faculty of Medicine and University Hospital Hradec Kralove Sokolska Czech Republic

Charles University Faculty of Education Prague Magdaleny Rettigove Czech Republic

Department of Oncology and Radiotherapy Charles University Faculty of Medicine and University Hospital Hradec Kralove Sokolska Czech Republic

Department of Radiology Charles University Faculty of Medicine and University Hospital Hradec Kralove Sokolska Czech Republic

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