Image-Guided Thermal Ablation of Colorectal Liver Metastases

Over the past decade, image-guided thermal ablation has emerged as a minimally invasive option for treating colorectal liver metastases. By delivering controlled heat via radiofrequency or microwave energy under real-time imaging, clinicians can target metastatic deposits precisely while preserving healthy liver tissue. Candidates typically include patients with a limited number of lesions, each usually smaller than 3 cm, and adequate organ reserve. Procedures are most often performed percutaneously, using ultrasound, computed tomography or image-fusion guidance, and may employ stereotactic platforms for enhanced needle placement. Advances in three-dimensional margin assessment and fusion software have improved local control rates, minimised complications and reduced hospital stays compared with open surgical resection. Although proximity to large vessels or bile ducts remains a challenge due to heat sink effects, technical refinements in energy delivery and intra-procedural verification of safety margins have expanded the ablative envelope. As a result, thermal ablation now complements resection in multidisciplinary care pathways and, in select unresectable cases, offers a potentially curative alternative.

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Image-Guided Thermal Ablation of Colorectal Liver Metastases publication trend

The graph below shows the total number of articles in image-guided thermal ablation of colorectal liver metastases across all publications each year (not limited to Nature Index journals).

Technical terms

Image-guided thermal ablation: A minimally invasive technique using imaging modalities to direct thermal energy to tumour tissue.

Colorectal liver metastases (CRLM): Secondary liver tumours originating from colorectal carcinoma.

Radiofrequency ablation (RFA): Delivery of alternating electrical current to generate heat and induce coagulative necrosis.

Microwave ablation (MWA): Use of electromagnetic waves to heat and destroy tumour cells.

Ablation margin: The zone of apparently normal tissue surrounding the target lesion that is included in the ablation volume to ensure complete eradication.

Local tumour progression (LTP): Recurrence or growth of malignant tissue at the site of ablation following initial technical success.

References

1. Radiofrequency and Microwave Ablation Compared to Systemic Chemotherapy and to Partial Hepatectomy in the Treatment of Colorectal Liver Metastases: A Systematic Review and Meta-Analysis. CardioVascular and Interventional Radiology (2018).
2. Resectability and Ablatability Criteria for the Treatment of Liver Only Colorectal Metastases: Multidisciplinary Consensus Document from the COLLISION Trial Group. Cancers (2020).
3. Volumetric assessment of the periablational safety margin after thermal ablation of colorectal liver metastases. European Radiology (2021).
4. The local efficacy and influencing factors of ultrasound-guided percutaneous microwave ablation in colorectal liver metastases: a review of a 4-year experience at a single center. International Journal of Hyperthermia (2018).