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Purpose: The efficacy of nerve sparing techniques to save potency in cystoprostatectomy is about 50%. This radical surgery may be proposed to young men with normal sexual function. We report the results of a 13-year experience with our innovative seminal sparing cystectomy and bladder replacement to maintain sexual function in such patients. Materials and Methods: Seminal sparing cystectomy is a modification of standard radical cystectomy in which the posterior bladder dissection is anterior to the seminal vesicle plane to preserve the vasa deferens, seminal vesicles, prostatic capsule and neurovascular bundles. Ablation of the whole bladder and the prostatic urothelium with surrounding hypertrophic tissue is guaranteed, and injury to the pelvic nerve plexus that provides autonomic innervation to the corpora cavernosa is avoided. From April 1990 to December 2002 we performed 68 procedures in 63 patients (7 of whom were lost to followup) with superficial bladder cancer resistant to conservative therapies (18 patients with stage T1G2 disease, 13 TaG2, 11 T1G3 and 14 TaG3) and in 5 patients with invasive bladder cancer (T2G3) which was monofocal and away from the bladder neck. All patients had normal sexual function. A complete clinical evaluation (with prostate specific antigen [PSA], digital rectal examination and transrectal ultrasound) to exclude concomitant prostate cancer was performed. Average patient age was 49 years and mean followup was 68 months. Results: Normal erectile function was preserved in 58 patients (95%). Complete daytime continence was reached in 58 patients (95%) and nighttime continence was reached in 19 patients (31%). The early postoperative complication rate was 18% and the delayed complication rate was 26.2%. A total of 55 patients (90.2%) are alive and 6 patients (9.8%) died, 5 of cancer progression. High grade prostatic intraepithelial neoplasia was noticed in prostatic specimens in 3 patients and prostatic cancer was noted in 1 patient. These patients had a normal PSA before operation and a serum PSA less than 0.2 ng/ml at a mean followup of 19 months. No positive margins were identified on permanent histological analysis of the specimens, nor were local pelvic recurrences observed. Conclusions: Our innovative technique is safe, effective and easy to perform. The oncological and functional results obtained with a long followup justify seminal sparing cystectomy as an excellent surgical procedure which can be proposed to some oncological and nononcological cases.