الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Renal cell carcinoma represents 1–3% of all visceral neoplasms however, accounting for 85–90% of all solid renal tumors in adults. The recent introduction of multidetector CT (MDCT) into clinical practice has allowed radiologists to overcome most of the limitations of single-detector helical CT. We had 41 pathological lesions in 21 renal units in 40 patients where one case presented by bilateral renal masses. The malignant lesions were 31 cases (15 case of clear type, 9 cases of chromophobe type and 7 cases of papillary type) while the benign lesions were 10 cases (2 cases of AML, 2 cases of oncocytoma and 6 cases of inflammatory condition). We measure the attenuation value as a functional parameter in non contrast scan, corticomedullary, Nephrographic and delayed phases and we found that non contrast scan showed no significant value in discrimination between benign and malignant lesions or between different subtypes of RCC. In corticomedullary phase there is a significant statistical difference between clear cell, chromophobe and papillary types.In nephrographic phase statistical analysis found that 96 HU is the highest cutoff value in differentiating the hypervascular (clear) type from hypovascular (chromophobe and papillary) types with sensitivity of 70%, and the specificity of 88%. In delayed phase there is significant difference (p= 0.03) between the papillary type and the clear type. In conclusion, MDCT and post processing techniques is the modality of choice in diagnosing and characterization of renal masses with very high accuracy in detection of the lesion.