Transurethral incision of the bladder neck (TUI-BN) was performed in a 64 year-old woman with detrusor underactivity after radical hysterectomy. The bladder neck incision was performed by electrical Gutting of the bladder neck muscles at the 5 and 7 o'clock positions. The incision was not extended to the middle urethra to avoid injury to the stated urethral sphincter. After TUI-BN, the patient could void 200-250 mL by abdominal straining. Although the postvoid residual remained 100-150 mL after TUI-BN, the patient needed to catheterize Herself only once per day before bed-time. Her quality of life improved and no urinary incontinence was noted after TUI-BN.