To describe a new technique of unilateral complete extraperitoneal ureterostomy during laparoscopic radical resection of bladder cancer, and evaluate the efficacy of this technique in the treatment of a patient with grade T₄ infiltrating urothelial carcinoma of the bladder.

A case study of a 75-year-old man with a malignant tumor of the bladder (T₄N₀M₀) was conducted to introduce the four key steps of a unilateral complete extraperitoneal ureterostomy during radical cystectomy by laparoscope, which include separate ureter (separate the left ureter into a sufficient length), collect two ureters (pull the left ureter behind the rectum to the right), establish an extraperitoneal passage (expand the right extraperitoneal space, pull the two ureters out of the passage), and reconstruct the peritoneum.

The total operation time was 248 minutes (from the start of the disinfection to the end of the ureterostomy), the blood loss was 100 ml, clear urine outflow was visible at the stoma, and the postoperative hospital stay of the patient was 8 days.

This is an attempt at a complete laparoscopic ureterostomy with less trauma, less bleeding and shorter postoperative recovery time than conventional ureterostomy. This is a feasible and safe urinary diversion for patients who need permanent urinary diversion, but have poor cardiopulmonary function, high surgical risk, or no opportunity for intestinal urinary diversion.