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Objectives:Evaluation of kidney size and volume is very important in the diagnosis, treatment and follow-up of kidney diseases. Ultrasonography is the preferred imaging modality which provides a safe, reliable and affordable way of imaging the kidneys in the follow up of kidney diseases..In this study, we aimed to determine the kidney volume in normal adults and try to find out which of the physical features are more related with kidney volume.Materials and Methods:Between June 2005 and December 2008 177 patients referred for routine abdominopelvic ultrasonography (US) were included in the study. 16 patients who had renal masses, hydronephrosis and nephrolithiasis were excluded. Height, weight, body surface area (BSA) and body mass index (BMI) of the patients were recorded. Renal ultrasonography was performed and kidney sizes were evaluated in lateral decubitis position. Kidney sizes were measured on longitudinal and transverse scan. Ellipsoid formula was used to determine the kidney volume.Results:A total of 161 patients 69 (42,8%) male, 92 (57,5%) female were enrolled in the study. Mean kidney volume for right kidney was 125 mL and 134 mL for left kidney in women whereas it was 149 mL for right kidney and 155 mL for left kidney in men. There was a significant difference between right and left kidney volumes (p

Objectives:The aim of this study is to evaluate the diagnostic value of mean and net enhancement attenuation values, net enhancement percentage in discrimination of Bosniak category 3 and 4 lesions on multiphasic computed tomography (CT).Materials and Methods:A search was performed through the PACS system using the key word “Bosniak cyst” to identify candidates for the study population. Twenty nine patients with Bosniak category 3 and 4 were enrolled in the study. Enhancement values were measured on precontrast, corticomedullary and nephrogram phases. Net enhancement attenuation value and net enhancement percentage were calculated. The presence of calcification on cyst wall/septa, renal vein thrombosis or lymphadenopathy and mean diameter of these complex cystic lesions were utilized.Results:Bosniak category 4 cysts had a significantly higher mean attenuation value compared with that of Bosniak category 3 cysts on corticomedullary and nephrogram phases (167.2±53.6 HU, 99.8±43 HU; p=0.001, p=0.023; respectively). Significant differences were observed between two pathologies with regard to net enhancement value and net enhancement percentage (p=0.003, p=0.015; respectively). By the use of ROC curve analysis, the cut off value of 131 HU for the mean attenuation value of Bosniak category 4 cyst on corticomedullary phase had the appropriate combination of sensitivity of 82% and specificity of 83% with the area under the cure being 0.848±0.081 (95% CI: 0.68-1).Conclusion:Bosniak category 4 cysts had larger net enhancement value and enhancement percentage. A value of >131 HU on corticomedullary phase can be a predictor value for Bosniak category 4 cysts.