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Excellent results of vasectomy reversal have been reported by Silber and Owen in 1977 using microsurgical technique without splints. Herein, we report two cases of male sterility due to previous voluntary vasectomy in which fertility was restored by microsurgical vasovasostomy. The reason for vasectomy reversal in these cases was a subsequent marriage. Case 1: A 36-year-old male who had had vasectomy 3 years earlier, underwent vasovasostomy on September 20th 1976. The sperm granuloma was not found, but sperm was observed in the fluid from the proximal cut-end of the vas deferens at the time of operation. He fathered a baby on October 2, 1977. Case 2: A 43-year-old male who had had vasectomy 10 years ago underwent vasovasostomy on February 5th 1980. Sperm granuloma was observed at the time of operation. He fathered a baby on February 25th 1981. The important factors that determine the success of vasectomy reversal are the method and time of reversal. 1) Microsurgical two-layer vasovasostomy is the most reliable method among the various operations for vasectomy reversal. 2) A shorter duration between vasectomy and it's reversal, and the existence of sperm granuloma after previous vasectomy increase the possibility to restore fertility.

Twenty-five primary ureteral tumors treated at our University between 1963 and 1981, were reviewed retrospectively. The conclusions of this study are as follows. Sex and age distribution of the patients were 18 males and 7 females (2.6: 1), and average age was 63.04 years old. The major symptom was hematuria. The majority of the patients were admitted to our clinic within 6 months from manifestation of symptoms. The major finding of IVP was non-functioning kidney. The positive rate of urinary cytology was 63.2%. Total nephroureterectomy with bladder cuff was performed in 21 out of 23 cases. Histologically, 22 cases were transitional cell carcinoma and one case was squamous cell carcinoma. Simultaneous urothelial tumor was found in 13 cases in the bladder. Most of the ureteral tumors (63.6%) were found in the lower third segment of the ureter. Subsequent urothelial tumors were seen in 3 bladders and one urethra out of 22 cases receiving surgical treatment in the follow-up period. The 5-year survival rate by actuarial method was 39.4%. Among several factors, grade and stage of tumor were the most influencing factors for prognosis. An effective method of post-operative treatment could not be established.

Forty primary renal pelvic tumors treated at our University between 1963 and 1981, were reviewed retrospectively. The conclusions of this study are as follows. Sex and age distribution of the patients were 30 males and 10 females (3: 1), and average age was 60.5 years old. The major symptoms were hematuria and flank pain; however, palpable mass was rare. The majority of patients were admitted to our clinic within 6 months from manifestation of symptoms. The major findings of IVP were non-functioning kidney and filling defect. The positive rate of urinary cytology was 46.7%. Total nephroureterectomy with bladder cuff was performed in 20 out of 32 cases. Histologically, 29 cases were transitional cell carcinoma and 4 cases were squamous cell carcinoma with renal calculi. Simultaneous urothelial tumors were seen in 10 cases, 3 in the ureter and 7 in the bladder. A subsequent ureteral tumor was found in one out of 12 cases in which ureters were resected incompletely, and 7 subsequent bladder tumors were found out of 32 cases receiving surgical treatment in the follow-up period. The 5-year survival rate by the actuarial method was 75.9%. Among several factors, grade and stage of the tumor were the most influencing factors for prognosis. An effective method of post-operative treatment could not be established.

The effects of intravesical instillation of Carboquone at the clinically used doses of 5 and 10 mg on the normal mucosa of female beagle dogs was compared with that of 10 mg Mitomycin C used as the control drug. Intravesical instillation for 48 hours of 10 mg carboquone/20 ml phosphate buffer solution (PBS) after bilateral cutaneous uretrostomies produced severe inflammatory changes in all layers of the bladder wall. However, no secondary effects were observed in blood laboratory examinations or histological examinations of the whole organ after autopsy. Phosphate buffer solution produced no remarkable secondary effects in animals. Five milligrams carboquone per 20 ml PBS was instilled intravesically once a week for 3 weeks in normal animals. Cystoscopically , the bladder mucosa recovered normally. Blood laboratory examinations showed no abnormal results, but the bladder epithelium had regenerative epithelial hyperplasia and slightly inflammatory changes in the submucosal layers. Two of the three control animals given instillation of 10 mg of Mitomycin C/20 ml PBS had slight leucopenia at 7 days after the last intravesical instillation, but leucocyte count was normal at the end of the experiment. Cystoscopic and histological examination of the epithelium of the urinary bladder revealed severe inflammatory changes in 2 of the 3 animals.