This document discusses interventional radiology techniques for renal tumors, including biopsy and radiofrequency ablation (RF). It first covers using biopsy for diagnosing small solid renal tumors, noting its accuracy and importance for determining appropriate treatment. RF is then discussed as a treatment option for renal tumors. The technique, evaluation criteria pre-procedure, expected results from studies showing effectiveness rates of 80-90% and predictive factors for success, and post-procedure follow up are summarized. RF ablation is indicated for tumors under 4 cm, especially if exophytic or in high-risk patients.