In recent years.diagnostic imaging techniques

especially ultrasonography （US） and CT scanning

have been widely adopted in clinical practice

making early accurate diagnosis of renal tumors possible.A total of 452 cases of renal tumors have been admitted to the institute since 1951

of which 220 were seen from 1951 to 1979 and 232 in the past 9 years （1980-1988）.The frequency of renal parenchymal tumors was obviously higher in the latter group

including asymptomatic renal carcinoma in 20.2% and hamartoma in 38.1%. All these were discovered on routine physical check-up by ultrasonography and/or CT scanning and would otherwise have gone undiagnosed on conventional urography.Ultra- sonography and CT can also reveal the nature and the extent of the tumor.The idea that “a renal tumor should be considered malignant unless pathologically proven otherwise”is no longer valid.However

general manifestations of renal carcinoma

such as elevated erythrocyte sedimentation rate （ESR）

hypertension

malaise

anemia

fever and hypercalcemia

still deserve proper attention.We suggest that ultrasonography of both kidneys should be mandatory in routine physical check-up

as far as the urinary system is concerned

in order to discover asymptomatic renal tumors.