Percutaneous Pulmonary Tumor Ablation

Background and indications

Percutaneous lung tumor ablation (radiofrequency, microwave, or cryoablation) is a curative or palliative treatment for primary lung tumors (early-stage non-small cell lung cancer - NSCLC stage I) and pulmonary metastases (oligometastatic). It is primarily offered to patients who are not surgical candidates due to insufficient respiratory function, significant comorbidities, or surgical refusal.

Pre-procedure assessment

Assessment includes chest CT, PET-CT, pulmonary function tests, percutaneous biopsy (if histological diagnosis not obtained), and tumor board discussion. Tumor location (distance from pleura, major vessels, and bronchi) influences technique choice.

Procedure

Under general anesthesia and CT guidance, an ablation needle is inserted into the tumor percutaneously via transcostal approach. For tumors ≤ 2 cm, a single microwave antenna suffices. For tumors > 2 cm, multiple antennae or probes may be needed. Cryoablation is preferred for tumors near the mediastinum (better safety profile near central structures). Immediate contrast-enhanced CT verifies the ablation zone. The procedure takes 1 to 2 hours.

Results and scientific evidence

For stage IA NSCLC (≤ 2 cm), microwave ablation offers 85-95% local control rate and 60-70% 3-year survival in non-surgical patients. For oligometastatic pulmonary metastases (1-5 lesions ≤ 3 cm), local control is 70-90% at 2 years. Lung cryoablation showed similar results in multicenter series (de Baere et al., Radiology, 2015; DOI: 10.1148/radiol.2015142690).

Risks and complications

Pneumothorax (20-40%, 10-15% requiring drainage), alveolar hemorrhage (hemoptysis: 5-10%), reactive pleural effusion (5-10%), chest pain (20-30%). Peri-procedural mortality is 0.5-1%.

Recovery

1-2 night hospitalization (pneumothorax monitoring). Control CT at 1, 3, 6, and 12 months.

Practical information

The procedure is performed as a short inpatient stay. It is performed by an interventional oncology radiologist, in coordination with the pulmonologist and oncologist.