 Using an electrically insulated 12ga introducer with trocar is inserted percutaneously into the renal tumor. The needle tip will be placed 20mm from the center of the target. The trocar is removed and co-axially i.e. within the introducer, a core biopsy of the lesion is performed with a 14-18 gauge needle. The radiofrequency applicator with a 14ga cannula containing the loosely wound coil electrode is then optimally positioned and locked into the introducer. Applicator is rotated to line up target with coil trajectory. Coil introducer pliers are used to deliver the coil into the tissue. Four dispersive electrodes grounding pads are adhered on the thighs of the patient. The applicator is connected to the generator and grounding pads. Energy will be applied in a single heating cycle for 4-10 minutes at a power rating set between 125-200W based on manual feedback and size of target. Development of the thermal lesion will be monitored with real time B mode US. At the end of the procedure the coil electrode is retracted with aid of the rectractor pliers and then applicator with introducer is removed. 