A 14-month-old girl presents with a febrile urinary tract infection (E. coli, >100,000 CFU/mL). Renal-bladder ultrasound reveals a left duplex collecting system with hydronephrosis of the upper pole moiety and a thin-walled cystic intravesical mass at the left ureteral orifice that varies in size with bladder filling. VCUG shows ipsilateral lower pole vesicoureteric reflux (Grade III) and a filling defect at the ureterocele. The structure marked **A** in the diagram is the cystic mass at the bladder trigone. Which of the following best describes the embryological defect responsible for this lesion?
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