Stereotactic Body Radiation Therapy Versus Radiofrequency Ablation for Small Renal Masses

Inclusion Criteria: * Patients ≥18 years of age and capable of providing informed consent * Patients scheduled for treatment of their SRM using SBRT or RFA * Patients who received a biopsy of their SRM prior to their scheduled SBRT or RFA treatment * Patients who are willing to have a biopsy 12 months post-procedure * Patients with renal tumor(s) ≤ 4.0 cm Exclusion Criteria: * Patients with large renal tumor(s)\>4.0 cm * Patients who are unable to have a general anesthetic * Patients who did not receive a biopsy of their SRM prior to their scheduled SBRT or RFA treatment * Patients who are unable to comply with post-operative and/or follow-up protocol/phase of study * Evidence of metastatic disease * Uncorrectable bleeding diathesis