Fig. 1

The surgery procedure of 980 nm diode laser en bloc resection of bladder tumor. A A circumferential incise was made about 0.5–1 cm away from the boundary of tumor. B The incision was deepened into the bladder muscular layer under the tumor. Then sharp and blunt dissection was performed between the muscular layer and the serosa of the bladder. C The incision was made along layer between the muscular layer and the serosa of the bladder. Lastly, the tissue mass was completely removed. D The tumor was en bloc resected, and the wound surface was observed