Related Experiment Video
Updated: Jul 11, 2025

Unilateral Ureteral Obstruction Model for Investigating Kidney Interstitial Fibrosis
Published on: April 25, 2025
A case of mid-ureteral stricture with ipsilateral atrophic kidney in a young adult
Arisa Machida1, Masakazu Abe1, Shuhei Ishii1
1Department of Urology Iwate Medical University School of Medicine Yahaba Japan.
Introduction:
Most congenital ureteral strictures occur at the ureteropelvic or ureterovesical junction in children. Mid-ureteral stricture is very rare and can cause congenital hydronephrosis. Only a few studies have reported on coexisting mid-ureteral stricture with ipsilateral atrophic kidney in young adults.
Case Presentation:
A 16-year-old girl presented with repeated urinary tract infection. Computed tomography revealed a right atrophic kidney and hydroureter. Retrograde pyelography showed a mid-ureteral stricture. Laparoscopic nephroureterectomy was performed, and histological examination revealed mid-ureteral stricture with hyperplasia of the fibrous connective tissue and an atrophic kidney.
Conclusion:
Mid-ureteral stricture in a young adult is extremely rare. Appropriate imaging studies including retrograde pyelography are necessary for accurate diagnosis of mid-ureteral stricture.
Related Concept Videos
Ureters
Kidney Transplant II: Surgical Procedure
Acute Kidney Injury II: Pathophysiology
Imaging Studies V: Intravenous Urography and Retrograde Pyelography
Anatomy of the Genitourinary System I: Kidneys and 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...

