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What Is Microwave Ablation?

Microwave ablation is a minimally invasive thermal treatment that destroys abnormal tissue by generating heat inside a targeted tumor. A thin microwave antenna is placed into or next to the lesion under imaging guidance, and electromagnetic energy agitates water molecules in the tissue to create high temperatures. The heated zone causes coagulative cell death in and around the target. Microwave ablation is commonly used for selected tumors in organs such as the liver, kidney, and lung and can also be used in other sites.

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What Is Microwave Ablation?

Microwave ablation is a minimally invasive thermal treatment that destroys abnormal tissue by generating heat inside a targeted tumor. A thin microwave antenna is placed into or next to the lesion under imaging guidance, and electromagnetic energy agitates water molecules in the tissue to create high temperatures. The heated zone causes coagulative cell death in and around the target. Microwave ablation is commonly used for selected tumors in organs such as the liver, kidney, and lung and can also be used in other sites.

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Why Is Microwave Ablation Performed?

The procedure is used for selected primary or metastatic tumors when local destruction is appropriate and surgery is unnecessary, too risky, or not preferred. It is commonly used for small liver tumors and can also treat selected renal, pulmonary, adrenal, bone, or other lesions depending on location and expertise. Treatment planning considers tumor size, number, proximity to large vessels or sensitive structures, organ function, prior therapy, and the possibility of complete ablation with an adequate margin. Microwave ablation can be used with curative intent in selected localized disease or for local control and symptom relief in other settings.

How Is Microwave Ablation Performed?

The patient receives sedation or anesthesia, and ultrasound, computed tomography, or magnetic resonance imaging is used to plan and guide antenna placement. One or more microwave antennas are inserted through the skin or placed during laparoscopic or open surgery so the planned ablation zone covers the tumor and an appropriate margin. Microwave energy is delivered for a controlled period while imaging and device parameters help the operator estimate the developing heat zone. Follow-up imaging confirms the treatment area and checks for residual viable tumor or complications.

What Is Recovery Like After Microwave Ablation?

Many percutaneous procedures require only a short hospital stay or outpatient observation, although recovery varies by organ, tumor size, and anesthesia. Temporary pain, fatigue, low-grade fever, nausea, or soreness near the treatment site can occur as the ablated tissue becomes inflamed. Activity is increased gradually while the puncture site heals, and laboratory tests can be used to monitor organ function when relevant. Follow-up computed tomography or magnetic resonance imaging is used to assess treatment response and determine whether repeat ablation or another therapy is needed.

What Are the Risks and Complications?

Possible complications include bleeding, infection, pain, injury along the needle path, and thermal damage to nearby organs, nerves, bile ducts, bowel, or blood vessels. Lung ablation can cause pneumothorax, while liver and kidney ablation have additional organ-specific risks such as bile-duct injury, urine leak, or impaired organ function. Heat can extend beyond the intended target when anatomy or energy delivery is unfavorable. Local tumor persistence or recurrence can occur if the entire lesion and treatment margin are not successfully ablated.

Frequently Asked Questions About Microwave Ablation

Is microwave ablation the same as radiofrequency ablation?

No. Both are heat-based tumor treatments, but microwave ablation uses electromagnetic microwave energy while radiofrequency ablation uses alternating electrical current.

What tumors can microwave ablation treat?

It is commonly used for selected liver, kidney, and lung tumors and can be applied to other sites when tumor size, location, and surrounding anatomy are suitable.

Is microwave ablation performed through open surgery?

It can be performed percutaneously through the skin, laparoscopically, or during open surgery. Percutaneous image-guided treatment is common.

Can a tumor return after microwave ablation?

Yes. Local recurrence can occur when viable tumor remains at the margin, and new tumors can also develop elsewhere depending on the underlying cancer.

References

Thermal Ablation for Tumor Treatment. RadiologyInfo.org. https://www.radiologyinfo.org/en/info/thermal-ablation-therapy. Date Accessed September 11, 2026.

Microwave Ablation in the Liver: An Update. PubMed. https://pubmed.ncbi.nlm.nih.gov/32681731/. Date Accessed September 11, 2026.

CIRSE Standards of Practice on Thermal Ablation of Liver Tumours. PubMed. https://pubmed.ncbi.nlm.nih.gov/32382856/. Date Accessed September 11, 2026.

An Updated Systematic Review and Meta-Analysis on the Technical, Oncologic, and Safety Outcomes of Microwave Ablation in Patients with Renal Cell Carcinoma. PubMed. https://pubmed.ncbi.nlm.nih.gov/37819699/. Date Accessed September 11, 2026.

Microwave Ablation in Primary Lung Malignancies. PubMed. https://pubmed.ncbi.nlm.nih.gov/31680724/. Date Accessed September 11, 2026.