Introduction. Congenital abnormalities in urology are very common. Ectopic ureter, ureterocele, strictures and ureteral diverticula as well as duplex systems are the most common in this respect. The combination of abnormalities and stones is of clinical importance. The question arises as to whether the standard procedures for calculi also apply to stones in abnormal ureters. Objective. Let us review our experience with ureteroscopy in treating patients with abnormal ureters and evaluate the effectiveness of this approach. Material and methods. Four patients with abnormal ureteric stones who were treated by ureteroscopic procedures were identified. Information, preoperative calculus burden, operative information (ureteroscope size, lithotrite used, instruments used, duration of surgery, complications, stenting), follow-up imaging, and complications were obtained from the medical record. This information was analyzed to determine the most commonly used tools and stone-free rates. Results. Four patients were included in the study. The mean age of the patients was 58 years. The average operating time for the laser lithotripsy procedure was 40 minutes. Ureteral stricture was detected in 3 patients, ureterocele in 1 patient. Three of the patients (75%) were «stone free» in 2 weeks after ureteral stent extraction. None of the patients had changes in back pressure, gross hematuria, or abdominal pain during the follow-up period. Hospital stay varied between 5 and 7 days. Conclusion. Ureteroscopy with laser lithotripsy a reasonable alternative to shock wave lithotripsy in the management of patients with abnormal ureteral stones. The procedure is safe and effective and avoids the complications of open surgery.