Related Experiment Video
Updated: Oct 3, 2026

Assessing Urinary Tract Junction Obstruction Defects by Methylene Blue Dye Injection
Published on: October 12, 2017
[Secondary obstructive megaureter with detrusor-sphincter dyssynergia in children]
Abstract:
29 boys with secondary obstructive megaureter due to detruzor-sphincter dyssinergy were treated in 1989-1998. To normalize detruzor-sphincter relations, transurethral sphincterotomy was made in 25 boys. Later, 16 of them underwent autocatheterization of the urinary bladder and received alpha-adrenoblockers. Reconstructive plastic operations were performed in 34.5% (secondary megaureter of the degree III-IV). The author thinks more valid not to use the term "secondary obstructive megaureter" but to integrate this compound urinary tract lesion (megaureter with dyssinergy associated with diffuse dysplastic changes in the kidneys) into one syndrome. In secondary megaureter, longitudinal ureteral modelling is valid as this facilitates its reimplantation. Urodynamic examinations of the lower urinary tracts showed that sphincterotomy reestablished micturition in many cases, though high miction and intraabdominal pressure in dysadaptation of detruzor evidences for the existence of detruzor-sphincter dyscoordination in latent denervation of the urinary bladder.
Related Concept Videos
The Micturition Reflex
The process begins with bladder filling, where the bladder wall stretches as urine accumulates. This stretching activates the urine storage reflex, mediated by the sacral spinal segments and the pontine storage center. Efferent sympathetic impulses stimulate the detrusor muscle to relax and the internal urethral sphincter to contract, facilitating urine...
Anatomy of the Genitourinary System II: Bladder and Urethra
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...
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
Urinary Tract Calculi VI: Surgical Management