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Objective: This report presents the results of a randomized prospective study comparing synchronous transurethral cystolitholapaxy and transurethral resection of the prostate (TURP) with transurethral cystolitholapaxy plus medical treatment for benign prostatic hyperplasia (BPH) in patients with concomitant vesical stone(s) and BPH. Patients and methods: The study included 100 patients with bladder stone(s) < 2.5 cm associated with BPH. Eligible patients were divided randomly into two groups: group I (n = 50 patients) underwent simultaneous transurethral cystolitholapaxy and TURP, and group II (n = 50 patients) underwent transurethral cystolitholapaxy and received postoperative tamsulosin plus finasteride. Results: The mean follow-up was 20.1 ± 5.3 months. No statistically significant differences were found between the 2 groups regarding the preoperative parameters (age, prostatic volume, bladder stone characteristics, prostate-specific antigen level, International Prostate Symptom Score, peak urinary flow rate, and post-void residual urine volume). Both groups experienced statistically significant postoperative improvement in IPSS, post-void residual (PVR) urine volume, and peak flow rate compared with the preoperative parameters (P < 0.001 for all parameters). However, patients in group 1 had a more pronounced improvement (P < 0.001 for all parameters). Thus, 15 patients in group 2 underwent TURP during follow-up. PVR urine and prostate volume predicted the failure of medical therapy and the need for TURP. Conclusion: Synchronous transurethral cystolitholapaxy and TURP revealed better results than transurethral cytolitholapaxy plus medical therapy. Cystolitholapaxy without TURP should not be indicated especially in patients with significant PVR urine volumes and larger prostates. [ABSTRACT FROM AUTHOR]