Fig. 4

Lung parenchyma retraction while performing an image-guided percutaneous lung ablation. a, b RFA treatment with a straight needle of a metastatic lesion of a colon adenocarcinoma located in the left upper lobe, very close to the pulmonary hilum (white arrow). c After treatment, the treated area presents an image with a consolidative center and a ground-glass peripheral halo, suggesting a complete treatment (white arrow). A discrete retraction of the pulmonary parenchyma is evident, which, added to the presence of a mild pneumothorax (white triangle), mobilizes the hilar structures. d Control of the treated lesion after 12 months of RFA, no signs of recurrence are evident