 The patients will be evenly split between two groups, namely the acute and delayed. With the acute group, the study can meet its study objectives while minimizing the number of procedures and evaluate the safety of the device with the patient in an OR suite. However, it is difficult to predict tumor viability accurately based on cellular effects of the RF treatment when the lesion is excised immediately after. The purpose of a delayed group examines the full extent of histological thermal changes which do not occur until 6-7 days after the treatment. This group will also validate the feasibility of the device within the intended clinical setting of an interventional CT suite. 