الفهرس 
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Abstract
This study was conducted on fifty patients (twenty seven males and twenty three females) with different varieties of renal masses, their ages ranged from three years to sixty seven years with . Hematuria, Abdominal swelling, loin pain and weight loss are the most common symptoms in patients with renal masses.
Ultrasound and CT were done for all patients, US was the first imaging procedure to detect the characteristic features of the renal mass, it can be performed safely as it is noninvasive and painless and it is relatively inexpensive. US is usually able to provide good differentiation of solid from cystic masses. Furthermore, Doppler US allows for noninvasive assessment of vascular flow signals from tumor neovascularity.
CT is considered to be the golden standard in accurate characterization of renal masses, differentiation malignant from benign masses according to some criteria and staging of these malignant masses showing distant metastasis and lymph node enlargement. A major task of CT is the detection of small renal masses. Narrow slice thickness (<0.5mm) decreases partial volume effects, allowing the detection of smaller lesions.
The renal masses are classified into: benign masses (twenty seven cases) representing 54% and malignant masses (twenty three cases) representing 46% Renal cell carcinoma accounts for the majority of malignant renal tumors (fourteen cases) that represents and (48%), while Wilms’ tumor is the most common solid pediatric renal neoplasm (six cases) that represents (21%). Other malignant renal masses include (two cases) with non hodgkin lymphoma and one case with transitional cell carcinoma.
Of the renal masses, there were (twenty seven cases) with benign tumor. (twelve cases) with simple renal cysts, (four cases) with complicated renal cysts, (three cases) with autosomal dominant polycystic kidney disease, (two cases) with multicystic dyplastic kidney, (four cases) with angiomyolipoma, (one case) with oncocytoma, and (one case) with xanthogranulomatous pyelonephritis.
from this study we conclude that renal cell carcinoma is the most common solid renal neoplasm among the adult age group and Wilm’s tumor is the most common solid pediatric renal neoplasm . Although the vast majority of renal masses are renal cell carcinoma, various other lesions may have a particular clinical history or distinctive imaging features that differentiate them from renal cell carcinoma; however, despite the use of modern imaging techniques, renal neoplasms cannot always be diagnosed with pre-operative imaging.