We report a case of a solitary kidney and a single-system ectopic ureter draining into the vestibule in an infant with a Müllerian duct defect. Due to the absence of the upper vagina and uterus, an extremely underdeveloped bladder masqueraded as the vagina, and bladder agenesis was suspected preoperatively. Urinary continence was achieved using staged bladder surgery without augmentation or urinary diversion.
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