Presence of 2 separate pelvicalyceal collecting systems in 1 kidney
2 draining ureters may
Join above bladder (partial duplication)
Insert into bladder separately (complete duplication)
IMAGING
General Features
Ultrasonographic Findings
Fluoroscopic Findings
CT Findings
MR Findings
Nuclear Medicine Findings
Multimodality Findings
Imaging Recommendations
DIFFERENTIAL DIAGNOSIS
PATHOLOGY
General Features
Gross Pathologic & Surgical Features
Microscopic Features
CLINICAL ISSUES
Presentation
Demographics
Natural History & Prognosis
Treatment
Selected References
Houat AP et al: Congenital anomalies of the upper urinary tract: a comprehensive review. Radiographics. 41(2):462-86, 2021
Chan KKC et al: Unusual ureteric duplication abnormality in a child with pelvoureteric junction obstruction. BMJ Case Rep. 13(3), 2020
Ji H et al: Prenatal diagnosis of renal duplication by magnetic resonance imaging. J Matern Fetal Neonatal Med. 33(14):2342-7, 2020
Abdelhalim A et al: Ipsilateral ureteroureterostomy for ureteral duplication anomalies: predictors of adverse outcomes. J Pediatr Urol. 15(5):468.e1-6, 2019
Damasio MB et al: Comparative study between functional mr urography and renal scintigraphy to evaluate drainage curves and split renal function in children with congenital anomalies of kidney and urinary tract (CAKUT). Front Pediatr. 7:527, 2019
Tsiflikas I et al: Functional magnetic resonance urography in infants: feasibility of a feed-and-sleep technique. Pediatr Radiol. 49(3):351-7, 2019
Rodriguez MV et al: Robot-assisted laparoscopic common sheath ureteral reimplantation in duplex ureters: LUAA technique tips for optimal outcomes. J Pediatr Urol. 14(4):353-5, 2018
Didier RA et al: The duplicated collecting system of the urinary tract: embryology, imaging appearances and clinical considerations. Pediatr Radiol. 47(11):1526-38, 2017
Expert Panel on Pediatric Imaging:. et al: ACR Appropriateness Criteria® urinary tract infection-child. J Am Coll Radiol. 14(5S):S362-71, 2017
Giorlando F et al: Duplex collecting system in a pelvic kidney - an unusual combination. J Radiol Case Rep. 11(12):8-15, 2017
Mendichovszky I et al: Nuclear medicine in pediatric nephro-urology: an overview. Semin Nucl Med. 47(3):204-28, 2017
Michaud JE et al: Upper pole heminephrectomy versus lower pole ureteroureterostomy for ectopic upper pole ureters. Curr Urol Rep. 18(3):21, 2017
Flanagan SM et al: Fetal suprarenal masses--assessing the complementary role of magnetic resonance and ultrasound for diagnosis. Pediatr Radiol. 46(2):246-54, 2016
Khrichenko D et al: Intra- and inter-observer variability of functional MR urography (fMRU) assessment in children. Pediatr Radiol. 46(5):666-73, 2016
Ramanathan S et al: Multi-modality imaging review of congenital abnormalities of kidney and upper urinary tract. World J Radiol. 8(2):132-41, 2016
Sirisreetreerux P et al: Duplicated renal collecting system with ectopic ureter in female bladder exstrophy: a case report. Urology. 89:129-31, 2016
Cezarino BN et al: Diagnostic work-up and laparoscopic correction of an ectopic ureter. J Pediatr Urol. 11(5):285-6, 2015
Lee YS et al: Complications after common sheath reimplantation in pediatric patients with complicated duplex system. Urology. 85(2):457-62, 2015
Mansouri R et al: A case of obstructed hemivagina with ectopic ureter leading to severe hydrocolpos and contralateral renal outflow tract obstruction in a neonate. J Pediatr Adolesc Gynecol. 28(5):e131-3, 2015
Narchi H et al: Renal tract abnormalities missed in a historical cohort of young children with UTI if the NICE and AAP imaging guidelines were applied. J Pediatr Urol. 11(5):252.e1-7, 2015
Rubenwolf P et al: Presentation, management and long-term outcome of ureteropelvic junction obstruction in duplex kidneys. J Urol. 194(2):427-32, 2015
Schlomer B et al: Obstructed hemivagina and ipsilateral renal agenesis (OHVIRA) syndrome should be redefined as ipsilateral renal anomalies: cases of symptomatic atrophic and dysplastic kidney with ectopic ureter to obstructed hemivagina. J Pediatr Urol. 11(2):77.e1-6, 2015
Wang MH: Persistent urinary incontinence: a case series of missed ectopic ureters. Urol Case Rep. 3(6):223-5, 2015
Zderic SA et al: Voiding dysfunction: what can radiologists tell patients and pediatric urologists? AJR Am J Roentgenol. 205(5):W532-41, 2015
Bansal D et al: Pediatric laparo-endoscopic single site partial nephrectomy: feasibility in infants and small children for upper urinary tract duplication anomalies. J Pediatr Urol. 10(5):859-63, 2014
Figueroa VH et al: Utility of MR urography in children suspected of having ectopic ureter. Pediatr Radiol. 44(8):956-62, 2014
Avlan D et al: Pyeloureterostomy in the management of the lower pole pelvi-ureteric junction obstruction in incomplete duplicated systems. Urology. 76(6):1468-71, 2010
Jain P et al: Uncrossed complete ureteral duplication with dysplastic lower moiety: a violation of the Weigert-Meyer law. J Pediatr Urol. 4(5):404-6, 2008
Lipson JA et al: Subtle renal duplication as an unrecognized cause of childhood incontinence: diagnosis by magnetic resonance urography. J Pediatr Urol. 4(5):398-400, 2008
Castagnetti M et al: Transurethral incision of duplex system ureteroceles in neonates: does it increase the need for secondary surgery in intravesical and ectopic cases? BJU Int. 93(9):1313-7, 2004
Davidovits M et al: Unilateral duplicated system: comparative length and function of the kidneys. Clin Nucl Med. 29(2):99-102, 2004
Perez-Brayfield M et al: Endoscopic treatment with dextranomer/hyaluronic acid for complex cases of vesicoureteral reflux. J Urol. 172(4 Pt 2):1614-6, 2004
Wah TM et al: Lower moiety pelvic-ureteric junction obstruction (PUJO) of the duplex kidney presenting with pyonephrosis in adults. Br J Radiol. 76(912):909-12, 2003
Whitten SM et al: Accuracy of antenatal fetal ultrasound in the diagnosis of duplex kidneys. Ultrasound Obstet Gynecol. 21(4):342-6, 2003
De Caluwe D et al: Fate of the retained ureteral stump after upper pole heminephrectomy in duplex kidneys. J Urol. 168(2):679-80, 2002
Husmann DA et al: Is endoscopic decompression of the neonatal extravesical upper pole ureterocele necessary for prevention of urinary tract infections or bladder neck obstruction? J Urol. 167(3):1440-2, 2002
Decter RM: Renal duplication and fusion anomalies. Pediatr Clin North Am. 44(5):1323-41, 1997
Avni EF et al: Renal duplications: the impact of perinatal ultrasound on diagnosis and management. Eur Urol. 20(1):43-8, 1991
Presence of 2 separate pelvicalyceal collecting systems in 1 kidney
2 draining ureters may
Join above bladder (partial duplication)
Insert into bladder separately (complete duplication)
IMAGING
General Features
Ultrasonographic Findings
Fluoroscopic Findings
CT Findings
MR Findings
Nuclear Medicine Findings
Multimodality Findings
Imaging Recommendations
DIFFERENTIAL DIAGNOSIS
PATHOLOGY
General Features
Gross Pathologic & Surgical Features
Microscopic Features
CLINICAL ISSUES
Presentation
Demographics
Natural History & Prognosis
Treatment
Selected References
Houat AP et al: Congenital anomalies of the upper urinary tract: a comprehensive review. Radiographics. 41(2):462-86, 2021
Chan KKC et al: Unusual ureteric duplication abnormality in a child with pelvoureteric junction obstruction. BMJ Case Rep. 13(3), 2020
Ji H et al: Prenatal diagnosis of renal duplication by magnetic resonance imaging. J Matern Fetal Neonatal Med. 33(14):2342-7, 2020
Abdelhalim A et al: Ipsilateral ureteroureterostomy for ureteral duplication anomalies: predictors of adverse outcomes. J Pediatr Urol. 15(5):468.e1-6, 2019
Damasio MB et al: Comparative study between functional mr urography and renal scintigraphy to evaluate drainage curves and split renal function in children with congenital anomalies of kidney and urinary tract (CAKUT). Front Pediatr. 7:527, 2019
Tsiflikas I et al: Functional magnetic resonance urography in infants: feasibility of a feed-and-sleep technique. Pediatr Radiol. 49(3):351-7, 2019
Rodriguez MV et al: Robot-assisted laparoscopic common sheath ureteral reimplantation in duplex ureters: LUAA technique tips for optimal outcomes. J Pediatr Urol. 14(4):353-5, 2018
Didier RA et al: The duplicated collecting system of the urinary tract: embryology, imaging appearances and clinical considerations. Pediatr Radiol. 47(11):1526-38, 2017
Expert Panel on Pediatric Imaging:. et al: ACR Appropriateness Criteria® urinary tract infection-child. J Am Coll Radiol. 14(5S):S362-71, 2017
Giorlando F et al: Duplex collecting system in a pelvic kidney - an unusual combination. J Radiol Case Rep. 11(12):8-15, 2017
Mendichovszky I et al: Nuclear medicine in pediatric nephro-urology: an overview. Semin Nucl Med. 47(3):204-28, 2017
Michaud JE et al: Upper pole heminephrectomy versus lower pole ureteroureterostomy for ectopic upper pole ureters. Curr Urol Rep. 18(3):21, 2017
Flanagan SM et al: Fetal suprarenal masses--assessing the complementary role of magnetic resonance and ultrasound for diagnosis. Pediatr Radiol. 46(2):246-54, 2016
Khrichenko D et al: Intra- and inter-observer variability of functional MR urography (fMRU) assessment in children. Pediatr Radiol. 46(5):666-73, 2016
Ramanathan S et al: Multi-modality imaging review of congenital abnormalities of kidney and upper urinary tract. World J Radiol. 8(2):132-41, 2016
Sirisreetreerux P et al: Duplicated renal collecting system with ectopic ureter in female bladder exstrophy: a case report. Urology. 89:129-31, 2016
Cezarino BN et al: Diagnostic work-up and laparoscopic correction of an ectopic ureter. J Pediatr Urol. 11(5):285-6, 2015
Lee YS et al: Complications after common sheath reimplantation in pediatric patients with complicated duplex system. Urology. 85(2):457-62, 2015
Mansouri R et al: A case of obstructed hemivagina with ectopic ureter leading to severe hydrocolpos and contralateral renal outflow tract obstruction in a neonate. J Pediatr Adolesc Gynecol. 28(5):e131-3, 2015
Narchi H et al: Renal tract abnormalities missed in a historical cohort of young children with UTI if the NICE and AAP imaging guidelines were applied. J Pediatr Urol. 11(5):252.e1-7, 2015
Rubenwolf P et al: Presentation, management and long-term outcome of ureteropelvic junction obstruction in duplex kidneys. J Urol. 194(2):427-32, 2015
Schlomer B et al: Obstructed hemivagina and ipsilateral renal agenesis (OHVIRA) syndrome should be redefined as ipsilateral renal anomalies: cases of symptomatic atrophic and dysplastic kidney with ectopic ureter to obstructed hemivagina. J Pediatr Urol. 11(2):77.e1-6, 2015
Wang MH: Persistent urinary incontinence: a case series of missed ectopic ureters. Urol Case Rep. 3(6):223-5, 2015
Zderic SA et al: Voiding dysfunction: what can radiologists tell patients and pediatric urologists? AJR Am J Roentgenol. 205(5):W532-41, 2015
Bansal D et al: Pediatric laparo-endoscopic single site partial nephrectomy: feasibility in infants and small children for upper urinary tract duplication anomalies. J Pediatr Urol. 10(5):859-63, 2014
Figueroa VH et al: Utility of MR urography in children suspected of having ectopic ureter. Pediatr Radiol. 44(8):956-62, 2014
Avlan D et al: Pyeloureterostomy in the management of the lower pole pelvi-ureteric junction obstruction in incomplete duplicated systems. Urology. 76(6):1468-71, 2010
Jain P et al: Uncrossed complete ureteral duplication with dysplastic lower moiety: a violation of the Weigert-Meyer law. J Pediatr Urol. 4(5):404-6, 2008
Lipson JA et al: Subtle renal duplication as an unrecognized cause of childhood incontinence: diagnosis by magnetic resonance urography. J Pediatr Urol. 4(5):398-400, 2008
Castagnetti M et al: Transurethral incision of duplex system ureteroceles in neonates: does it increase the need for secondary surgery in intravesical and ectopic cases? BJU Int. 93(9):1313-7, 2004
Davidovits M et al: Unilateral duplicated system: comparative length and function of the kidneys. Clin Nucl Med. 29(2):99-102, 2004
Perez-Brayfield M et al: Endoscopic treatment with dextranomer/hyaluronic acid for complex cases of vesicoureteral reflux. J Urol. 172(4 Pt 2):1614-6, 2004
Wah TM et al: Lower moiety pelvic-ureteric junction obstruction (PUJO) of the duplex kidney presenting with pyonephrosis in adults. Br J Radiol. 76(912):909-12, 2003
Whitten SM et al: Accuracy of antenatal fetal ultrasound in the diagnosis of duplex kidneys. Ultrasound Obstet Gynecol. 21(4):342-6, 2003
De Caluwe D et al: Fate of the retained ureteral stump after upper pole heminephrectomy in duplex kidneys. J Urol. 168(2):679-80, 2002
Husmann DA et al: Is endoscopic decompression of the neonatal extravesical upper pole ureterocele necessary for prevention of urinary tract infections or bladder neck obstruction? J Urol. 167(3):1440-2, 2002
Decter RM: Renal duplication and fusion anomalies. Pediatr Clin North Am. 44(5):1323-41, 1997
Avni EF et al: Renal duplications: the impact of perinatal ultrasound on diagnosis and management. Eur Urol. 20(1):43-8, 1991
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