A 76-year-old man with clinical stage T1c adenocarcinoma of the prostate underwent radical retropubic prostatectomy. After a cystography on postoperative day 7 demonstrated minimal contrast extravasation, gentle catheter traction was performed. However, a cystography on postoperative day 21 showed a displacement of the catheter out of the bladder due to more significant anastomotic rupture. The catheter was preserved without catheter traction for two months. A cystography revealed complete healing of anastomosis without extravasation. This case suggests that catheter traction for anastomotic leakage should be performed carefully because of a potential risk of further anastomotic leakage.