Table 2 Efficacy evaluation criteria for ablation

Complete ablation

Disappearance of the lesion

Complete formation of the cavity

Fibrosis of the lesion, which may be a scar

Reduction or no change or enlargement of the solid nodule, but no signs of enhancement on enhanced CT scan and/or no metabolic activity of the PET/CT

Pulmonary atelectasis, no signs of contrast enhancement on CT scan of the lesion within the atelectasis, and/or no metabolic activity of the PET/CT

Incomplete ablation

Incomplete cavity formation with partial solidity and enhanced CT scan with signs of enhancement and/or PET/CT with metabolic activity

Partial fibrosis with contrast enhancement on CT scan around or at the edge of the fibrosis and/or PET/CT with metabolic activity

Solid nodules with no change in size or increase in size with CT scan with signs of contrast enhancement and/or PET/CT with metabolic activity signs of intensification, and/or PET/CT with metabolic activity

Tumor cells found on the biopsy

Local progression

10 mm lesion enlargement with irregular or internal enhancement on CT and significantly increased FDG uptake on PET/CT

New local lesions with new signs of enhancement on CT and/or significantly increased FDG uptake on PET/CT