Figure 17a. Urinoma in a 49-year-old woman who had undergone radical hysterectomy for cervical cancer. (a) Abdominal ultrasonographic image shows a well-defined cystic mass posterior to the urinary bladder (arrow and cursors). (b) Contrast-enhanced CT scan shows a large fluid collection with ring enhancement in the presacral space (arrow). The diagnosis was confirmed with CT-guided percutaneous aspiration and drainage.