Related Experiment Video
Updated: Nov 8, 2025

Assessing Urinary Tract Junction Obstruction Defects by Methylene Blue Dye Injection
Published on: October 12, 2017
Bilateral hydroureteronephrosis: A neonatal presentation of bladder duplication
Benjamin Martin1, Sana Ali2, Simon P McGuirk2
1Department of Paediatric Surgery and Urology, Birmingham Children's Hospital, Steelhouse Lane, Birmingham B4 6NH, UK.
This case report highlights a rare congenital anomaly causing bilateral hydroureteronephrosis in a male neonate. Complex duplex kidneys with separate bladders mimicked common conditions, emphasizing the need for multidisciplinary diagnosis.
Area of Science:
- Pediatric Urology
- Congenital Anomalies
- Medical Imaging
Background:
- Bilateral hydroureteronephrosis in neonates often suggests posterior urethral valves.
- Early diagnosis and management are crucial for preserving renal function.
Observation:
- A male infant presented with bilateral hydroureteronephrosis and a palpable mass effect.
- Imaging revealed bilateral duplex kidneys with separate urinary bladders, one lacking an outlet.
Findings:
- The anomaly caused obstructive uropathy, leading to complete loss of function in the right kidney.
- Distended, tortuous ureters contributed to the mass effect.
Implications:
- Complex congenital anomalies can present similarly to more common conditions.
- Multidisciplinary collaboration is essential for accurate diagnosis and effective management of rare uropathies.
Related Concept Videos
Anatomy of the Genitourinary System II: Bladder and Urethra
Anatomy of the Genitourinary System I: Kidneys and Ureters
Urinary Bladder
In males, the bladder is situated in front of the rectum, while in females, it is positioned anterior to the vagina and uterus. The bladder floor contains an inverted triangular area called the trigone, defined by the two ureteric...
Ureters
Disorders of the Urinary System
Urinary tract infections (UTIs) are one of the most common urinary system disorders. They are caused by bacteria that enter the urethra and can spread to the bladder resulting in cystitis. Pyelonephritis is the result of a UTI that has ascended to the level of the...
Imaging Studies II: Ultrasonography

