الفهرس 
AbstractOnly 14 pages are availabe for public view
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Abstract
Renal masses are being discovered with increasing frequency due
to the large number of cross-sectional studies being performed in clinical
practice. Accurate characterization of renal masses is essential to ensure
appropriate case management and to assist in staging and prognosis (41).
Accurate characterization of complex renal lesions is based primarily on
the presence or absence of enhancement on contrast material enhanced
Magnetic Resonance (MR) images. When such enhancement is present, it
generally indicates a diagnosis of renal cell carcinoma (RCC) (excluding
benign masses like angiomyolipomas and oncocytomas). With MR
imaging, enhancement can be assessed by measuring signal intensity
changes or evaluated visually with or without image subtraction (91).
However, in view of recently reported concerns regarding the
development of nephrogenic systemic fibrosis in patients with renal
insufficiency who undergo contrast-enhanced MR imaging, there is
increasing interest in assessing nonenhanced imaging modalities that
might be useful for characterizing renal lesions (33).The aim of this study is to evaluate the role of contrast enhanced magnetic resonance imaging and the usefulness of diffusion weighted magnetic resonance imaging in differentiating benign from malignant renal masses and to assess the diffusion characteristics as well as apparent diffusion coefficient (ADC) values of different renal masses.In conclusion, breath-hold DW imaging could be easily added to a routine renal MR imaging protocol, is an accurate method for renal lesion characterization, and can yield useful information additional to that acquired with contrast-enhanced MR imaging. We recommend using high b values for better results.