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Updated: Jun 28, 2026

Assessing Urinary Tract Junction Obstruction Defects by Methylene Blue Dye Injection
Published on: October 12, 2017
Does diagnostic delay lead invariably to damage in episodic pelvi-ureteric junction obstruction?
C N Radhakrishnan1, D C S Gough
1Department of Paediatric Urology, Royal Manchester Children's Hospital, Manchester M27 4HA, UK.
Objective:
To determine the relationship between the length of history and renal function in patients with symptomatic pelvi-ureteric junction (PUJ) obstruction in childhood.
Patients And Methods:
The study included 41 children with symptomatic PUJ obstruction. The duration and details of their symptoms were recorded and the differential renal function estimated by isotopic renography.
Results:
The median (range) duration of symptoms was 24 (0.25-84) months; there was no statistically significant relationship between the duration of symptoms and differential function at presentation (P=0.148).
Conclusion:
There is no correlation between the duration of symptoms and renal function in children with PUJ obstruction. A delay in diagnosis cannot be directly linked to permanent renal compromise.
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