Segurança e Acuidade Diagnóstica da Biópsia Percutânea de Massas Renais: Uma Experiência Inicial de um Único Centro

Introduction: The characterization of renal masses by biopsy before a surgical procedure is currently an option. Without this prior characterization, patients with benign renal masses may be likely to undergo unnecessary surgeries. The purpose was to determine the diagnostic accuracy and safety of renal mass biopsy.Material and Methods: Prospective uni-institutional study of 38 patients submitted to renal mass biopsy in the period from July 2014 to May 2016.Results: The biopsy was diagnostic in 76.3% (n = 29) of the cases. In 21.7 %% (n = 6) of the diagnostic biopsies, histology showed benign lesions, namely oncocitoma. In patients undergoing surgery, there was a 100% overall agreement between the biopsy result and the pathological outcome of the surgical specimen. The complication rate was 5.3% (n = 2), classified as Clavien-Dindo I.Conclusion: Renal mass biopsy showed high diagnostic acuity and safety, which may prevent unnecessary surgeries. This procedure may be part of the evaluation prior to the decision to treat patients with renal masses.