Fig. 1

CT scan and surgical specimen. A At the time of diagnosis, a CT scan showed a 25x25x20 mm tumor in the vertex of the bladder, which was mostly located extravesically. No pathologically enlarged lymph nodes or distant metastases were demonstrated. B After six cycles of chemotherapy, the size of the tumor increased, and its base extended widely into the bladder. The tumor was 45x50x40 mm in size, and the CT image showed its invasion into the urachus. C A surgical specimen of the resected tumor with urachus and umbilical tissue is shown. There was evident invasion into the urinary bladder