Figure 1. 63-year-old woman with amelanotic melanoma. (a) CT scan of chest shows 4.5 cm pulmonary metastasis in the left lower lobe (LLL). (b) CT scan obtained during radiofrequency (RF) ablation shows superomedial position of the electrode within the mass. (c) CT scan obtained during RF ablation shows inferolateral position of the electrode within the mass, a small basal pleural effusion has developed. (d) CT scan obtained 1 month after RF ablation at level corresponding to (a) shows pulmonary metastasis of same size as before, but homogeneously hypodense.