Single system ectopic ureters and ureteroceles associated with dysplastic kidney

Area of Science:

• Pediatric Nephrology
• Urology
• Medical Imaging

Background:

• Obstructive renal dysplasia is a spectrum of congenital kidney abnormalities.
• A specific subgroup characterized by nonfunctioning kidneys, single collecting systems, and ectopic ureteral insertion/ureterocele is uncommon.
• Associated anomalies and increased infection risk are significant concerns.

Purpose of the Study:

• To describe an uncommon subgroup of children with renal obstructive dysplasia.
• To detail the clinical presentation, associated anomalies, and management implications.
• To emphasize the importance of accurate imaging for diagnosis and treatment planning.

Main Methods:

• Retrospective case series of eight children.
• Review of medical records, imaging studies (ultrasound, CT, MRI), and pathology reports.
• Clinical data analysis focusing on kidney morphology, collecting system anomalies, and co-occurring conditions.

Main Results:

• Eight children presented with nonfunctioning dysplastic kidneys, single collecting systems, and ectopic ureteral insertion and/or ureterocele.
• Kidney morphologies included classic multicystic dysplastic kidney (n=5), hydronephrotic multicystic dysplastic kidney (n=1), and hypoplastic kidneys (n=2).
• Significant comorbidities in 63% of patients included VACTERL association, congenital heart disease, and other genitourinary malformations.

Conclusions:

• This subgroup of renal obstructive dysplasia carries an increased risk of infection compared to other forms of unilateral multicystic dysplastic kidney.
• Accurate identification through imaging is essential for timely clinical management.
• Early detection facilitates the identification of associated anomalies and guides appropriate interventions.