Three month axial CT

A 77-year-old woman with biopsy-proven 1.8 cm left lower lobe adenocarcinoma (stage IA NSCLC) who was not considered a surgical candidate due to chronic obstructive pulmonary disease and cardiac risk factors. Supine three-month axial CT post RFA shows that the area treated has increased in size (arrow). This should not be mistaken for tumor recurrence.