The authors analyzed 5 cases of renal carcinomas confirmed by operation and pathologcally, which were selected from all the cases of selective angiography performed recently at the department of raiology, Busan National University Hospital. The result obtained were as follows : 1. Among the 5 cases of malignant tumors of the kidney, 4 cases were renal cell carcinomas, and 1 case was transitional cell carcinoma. 2. In the sex distribution , male to female was 3 : 2 . And all cases were over 51 years of age. 3. All the 5 cases were discovered at the left kidney ; 1 cases, in upper pole ; 2 cases, in mid-portion ; and 2 cases , in lower pole. 4. Clinical manifestations were hematuria in all 5 cases ; flank pin in 4 cases. But no palpable mass was demonstrated in any cases. 5. The renal angiographic findings : Of 4 cases of renal cell carcinomas, 2 cases revealed marked hypervascularity, 1 cases mild hypervascularity with multiple mulbery-like aneourysms, and 1 case avasularity with well demarcated margin. 1 case of transitional cell carcinoma showed hypovascularity with perivascular pooling and displacement of the upper dorsal branch of renal artery.