Microwave Ablation for Pulmonary Metastases From Colorectal Cancer

Inclusion Criteria: * Unresectable pulmonary metastases from colorectal cancer. * diagnosis by CT, and confirmed by percutaneous puncture biopsy. * Age range 18-70 years old. * Eastern Cooperative Oncology Group performance status 0-1. * Life expectancy of more than 3 months. * Adequate organ function. Exclusion Criteria: * Resectable lung metastases. * Life expectancy less than 3 months * Patients with cardiac pacemaker, cerebral aneurysm clips, implanted electronic instruments or other metal materials. * Coagulopathy with platelet count less than 50000. * Active infectious disease. * Age below 18 years. * Pregnancy of breastfeeding.