Interest of percutaneous renal biopsy for small renal masses

539 Background: Assess CT-scan guided renal biopsies relevance in the management of small renal masses. Methods: Retrospective analysis from 01/2007 to 12/2012 of percutaneous CT-scan guided renal biopsies performed at our institution for patients harboring renal tumors. Exclusion criteria were presence of metastasis and/or >4cm tumors. Data analyzed were pathological outcomes, management of the tumors and complications from the procedure during the 30 days post-biopsies. Results: 119 patients underwent a renal biopsy during this period. 79 presented the selection criteria. Renal biopsies lead to a diagnosis in 70 cases (88.6%) and were non contributive in 9 cases (11.4%). Among contributive biopsies, there were 46 (66%) cases of cancer and 24 cases (34%) of benign tumors. During follow-up, 2 (2.5%) patients presented Clavien-Dindo grade I-II complications: 1 acute urinary retention and 1 subfebrile lumbar pain. Conclusions: The yield of CT-scan guided renal biopsies to define pa...