A histopathological study was made with the 233 cases of urinary tract tumors. All these tumors wer.e submitted for histologic examination to the Department of Pathology, College of Medicine, Seoul National University Hospital during a period of 10 years from 1970 to 1979. These tumors consisted af 41 cases of renal tumor, 184 cases of bladder tumor, and 8 cases of ureter and urethral tumor. Forty one renal tumors consisted of 21 cases of renal cell carcinama and 6 cases of Wilms tumor, 12 cases of renal pelvis tumor, 1 case of cortical adenoma and 1 case of angiomyolipoma. Renal cell carcinoma reveals male female ratio as 2. 6 to 1. one hundred eighty four cases of urinany bladder tumor consisted of 5 cases of papilloma,171 cases of transitional cell carcinoma, 4 cases of squamous cell carcinoma, 2 cases of adenocarcinoma, and 2 cases of sarcoma. Male female ratio was 3. 7 to 1. Seventy per cent of all patients was distributed between 40 and 70 years. Average age of transitional cell carcinoma was 54. 6 years. Distr- ibution of grade of transitional cell carcinoma comprise4 of grade I (90 cases), grade ll (66 cases), grade III (15 cases). Ureter tumors, though 5 cases, are all transitional cell tumora and urethral tumors consisted of I case of verrucous carcinoma and 2 cases of benign neoplasm.
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