Malignant renal neoplasm: Because benign tumors of kidney are rare, so it is a good rule that all neoplasm of kidney which are recognized clinically should be treated as malignant. They are uncommon between the ages of 7&40(l).Rcna! cell carcinoma is the most common tumor of the kidney in adult. It arises from renal tubular cells.. It is rare in children &is more frequent in men than women. It is an adenocarcinoma &is the most common neoplasm(75%) of kidney. The tumor may invade loca!Iy& metastasize by way of blood stream &the lymphatics. Regional lymph nodes are involved in approximately 30% of patients, unfortunately sign &symptoms are usually meager until the disease is advanced. Gross haematuria is the most frequent presenting compliant. Diagnosis of mass in the kidney is best established by intravenous urogram(IVU). CT scan may confirm the diagnosis. Radical nephrectomy is treatment of choice &offers the only known chance of cure. The over all 5 years survival rate of patient is 35%.Angiomyolipoma (Hamartoma) is a benign tumor of the kidney that may rarely be confused with renal cell carcinoma. It occurs frequently in patient with tuberous sclerosis^. Wilms' tumor is the most common of malignant tumors of kidney in childhood. It is highly malignant mixed tumors consisting of connective tissue origin& epithelial structures ,it is usually discovered as palpable mass by mother or by examining physician. Treatment of primary tumor is radical nephrectomy. Adjunctive therapy with irradiation &chemotherapy is important in improving the survival. Transitional cell carcinoma is the most common tumor of renal pelvis & ureter. Squamous cell carcinoma may occur because of metaplastic changes. Clinical behavior of this tumor is dependant on degree of cellular differentiation &extent of invasion.( !|