BACKGROUND In the clinical treatment of diseases related to ureteral duplication,it is very important to make a clear diagnosis before surgery because different types of ureteral duplication correspond to different treatment options.Inverted Y ureteral duplication with ectopic ureters and multiple urinary calculi is clinically rare.This case can help clinicians increase their understanding of this disease and gain some experience in its diagnosis and treatment.CASE SUMMARY A 36-year-old male who was previously healthy presented to the hospital with lumbar pain.Percussion of the right kidney area showed the patient had pain.Computed tomography scans revealed multiple urinary calculi in the right urinary system.Computed tomography urography revealed a duplicated ureteral malformation with an ectopic ureter.A transurethral ureteroscopic holmium laser lithotripsy was performed successfully.Intraoperative retrograde ureterography was performed,and the ectopic ureter was visible.We informed the family of the intraoperative findings and suggested laparoscopic ectopic ureterectomy for the ectopic ureteral stones.Unfortunately,the family temporarily refused laparoscopic surgery.The patient did not feel any discomfort after one year of followup.CONCLUSION Inverted Y ureteral duplication with an ectopic ureter and multiple urinary calculi is rare.Clinicians must be highly vigilant,make a correct diagnosis before surgery,determine the type of ureteral duplication and the distribution of urinary calculi,and then draw up a reasonable treatment plan to avoid unnecessary complications.
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