RFA and MWA use heat, but they are not identical technologies
Freiburg describes both radiofrequency and microwave ablation as percutaneous CT-guided thermal treatments. RFA heats tissue using an electrode and electrical current, while MWA uses a microwave antenna to generate a thermal ablation zone. The choice depends on tumor geometry, location, equipment and center experience.
Tumor size, location and blood flow matter
Thermal ablation is generally most effective when a complete treatment margin can be created around a limited target without unacceptable injury to nearby structures. Freiburg notes that success is strongly influenced by target size and organ perfusion, because larger tumors and high blood flow can leave viable tissue at the margins.
- Number of liver lesions
- Largest tumor diameter
- Distance from major vessels and the heat-sink effect
- Proximity to bile ducts, gallbladder, bowel or diaphragm
- Ability to obtain a safe ablation margin
- Liver function and remaining healthy liver volume
- Disease elsewhere in the body
- Prior surgery, ablation, TACE, SIRT or radiation
A multidisciplinary review should decide whether ablation fits the cancer strategy
Freiburg's HCC center places radiofrequency and microwave ablation within an interdisciplinary treatment pathway. Charité also lists local ablative techniques within liver-cancer and metastatic-disease care. For international patients, the key question is not only whether a lesion can technically be ablated, but whether ablation is the best local treatment in the full oncologic context.
Treatment is image-guided through the skin in many cases
Freiburg describes CT-guided placement of a thin electrode or microwave antenna directly into the tumor. Depending on the lesion, centers may use CT, ultrasound or combined image guidance, with local anesthesia, analgesia, sedation or general anesthesia selected according to the planned procedure.
Ablation may be combined with other liver-directed treatments
Complex liver cases can require staged or combined strategies. Ablation may be used alongside surgery, systemic therapy or transarterial treatments such as TACE, depending on tumor biology, size, distribution and previous response. The sequence should be defined by the liver tumor board rather than assumed from one imaging finding.
Risks depend heavily on tumor location
Potential complications include pain, bleeding, infection, liver injury and damage to nearby structures. Thermal injury to bile ducts, gallbladder, bowel or diaphragm is especially relevant when tumors are close to these structures. Pneumothorax or pleural irritation can occur with lesions near the diaphragm, and incomplete ablation can require repeat treatment.
Follow-up imaging determines whether the ablation zone is complete
The procedure is not finished when the needle is removed. Contrast-enhanced CT or MRI is used to assess the treatment zone and later detect residual or recurrent tumor. International patients should agree in advance which center will review follow-up imaging and how quickly repeat treatment would be arranged if viable tumor remains.
Official sources
Sources last checked 2026-09-07.