Ultrasound-guided percutaneous biopsy for challenging perihilar focal liver lesions: diagnostic accuracy and safety assessment.

Purpose: In cases of perihilar focal liver lesions, distinguishing between benign strictures and malignancies is critical to prevent unnecessary surgery. Although the use of contrast-enhanced CT or MRI in combination with clinical and laboratory findings can aid in diagnosis, histologic examination is often necessary. Histologic specimens can be obtained through various techniques, including ERCP-guided brush cytology or intraductal biopsy, cholangioscopy-directed biopsy or endoscopic ultrasound (EUS). However, these methods have been associated with suboptimal sensitivity and specificity, sometimes leading to inconclusive results. Therefore, ultrasound-guided percutaneous biopsy (US-guided PB) may play a crucial role, but data is lacking for perihilar lesions. The objective of our study was to assess the technical feasibility and safety of US-guided PB for perihilar lesions.

Methods: We included 20 consecutive patients who underwent US-guided PB of perihilar liver lesions that were not suitable for surgery between June 2018 and October 2023.

Results: All samples were obtained using a Menghini needle 20G and were adequate for histological examination, with a mean diameter of 12.3 mm (range 3-40 mm). Out of the 20 patients, 11 were diagnosed with malignancy while the remaining 9 had inflammatory or fibrotic tissue samples. No adverse events related to the procedure were reported.

Conclusion: US-guided PB of perihilar liver lesions is a valuable and safe diagnostic approach to consider for patients who are not suitable for surgery.