INTRODUCTION: The objective of this study was to determine the incidence of @entity8 for clinically localised renal masses and the need for new diagnostic procedures to assess these lesions. MATERIAL AND METHODS: This retrospective study included @entity1 who underwent partial or radical nephrectomy between November 2010 and July 2013. All @entity1 underwent a multiphase helical computed tomography (CT), which revealed suspected @entity8 . The exclusion criteria were @entity5 , biopsy before surgery, and disseminated and locally advanced disease. Lesions were defined as follows: small  <= 4 cm, intermediate > 4 and  <= 7 cm, and large > 7 cm. RESULTS: A total of 226 @entity1 underwent radical or partial nephrectomy; of these 75 @entity1 were excluded. In all, 151 had masses suspected of being @entity5 on CT. The mean age was 62.9 years. The male: female ratio was 3:1. The distribution of small, intermediate and large lesions were 75 (49.7%), 47 (31.1%) and 29 (19.2%), respectively. Among the three types of lesions, 15 (20%), 5 (10.6%) and 3 (10.3%) were benign, respectively (p = 0.27). Partial nephrectomy was performed in 69.3% of @entity1 with small @entity5 versus 23.4% of @entity1 with intermediate @entity5 , p < 0.001. CONCLUSION: Benign lesions were observed in 20% of small renal masses  <= 4 cm even though CT revealed a suspect @entity8 . The need for new diagnostic approaches for clinically localised @entity8 is evident. FUNDING: not relevant. TRIAL REGISTRATION: not relevant.

High rate of benign histology in radiologically suspect XXXX .

@entity1 :: ('9606', 'Species') :: ['patients'] @entity8 :: ('MESH:D007674', 'Disease') :: ['renal lesion', 'renal lesions', 'renal malignancy', 'benign renal lesions'] @entity5 :: ('MESH:D009369', 'Disease') :: ['malignant tumours', 'tumours', 'cystic tumours']
@entity8 :: (MESH:D007674,Disease) :: ['renal lesions']
