Figure 6a. Single small pulmonary metastasis in the right lower lobe in a 54-year-old woman who had undergone right mastectomy for breast carcinoma. (a) Axial CT scan shows metastasis in the right lower lobe. (b) CT scan shows an RF electrode within the metastasis. (c) Follow-up CT scan obtained 6 months later shows the mass abutting the pleural surface with surrounding retraction of adjacent parenchyma, but with no significant increase in size.