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Uptodate Reference Title
Embryology of a complete uretal duplication and ectopic ureter
Embryology of a complete uretal duplication and ectopic ureter
Schematic embryologic development of a complete duplex renal system with the formation of two ureteral buds. Note that the cranial ureteral bud drains the lower pole of the kidney and the caudal ureter bud the upper renal unit. In general, pathology occurs when the caudal ureteral bud inserts in an abnormal distal ectopic location in the bladder (ie, ectopic ureter) or caudal to the bladder causing upper pole ureteral obstruction. When the cranial ureter inserts abnormally, lower pole ureteral reflux can occur.