The kidney scan and the excretory urography of 21 cases in kidney disease proved clinically or pathologically at Uonsei University, Severance Hospital were reviewed and analysed briefly. RESULTS : 1. In all except 2 cases of pyelonephritis, changes on the kidney scan were noted with generalized mottled density and cold area in the kidney, and with diffuse poor or non uptake density and various size or shape of the kidney. 2. On the excretory urogram, the demonstrable findings n the kidney parenchyma were discribed on the only 7 of 21 cases, hypernephroma, tuberculosis kidney, necrotizing papillits, medullary sponge kidny, and stenosis of relnal artery. 3. Three of all cases, renal carbuncle, retroperitoneal hematoma with aberrent vessel and angiolipomyoma were o appreciable finding on the pyelography, but on the view of kidney scannig, there were apparently demonstrated abnormal cold area and some enlargement of kidney size. We concluded that the close correlation of the two techniques, kidney scanning and excretory urography on the kidney disease leads to more improved diagnostic accuracy.