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Upper urinary tract obstruction in children: current controversies in diagnosis
1Department of Urologic Surgery, University of Minnesota Hospital and Clinic, Minneapolis.
Insights
Diuresis-enhanced renography is a key diagnostic tool for pediatric upper urinary tract obstruction. This method, along with pressure flow studies when needed, aids in accurate diagnosis and surgical decision-making for children.
Area of Science:
- Pediatric Urology
- Diagnostic Imaging
- Nephrology
Background:
- Upper urinary tract obstruction (UTO) in children can be challenging to diagnose, especially in asymptomatic cases.
- Conventional imaging like intravenous urography and renal ultrasonography often lack definitive diagnostic power for subtle or intermittent obstruction.
Purpose of the Study:
- To outline a structured approach for the evaluation and treatment of pediatric upper urinary tract obstruction.
- To highlight the diagnostic utility of diuresis-enhanced renography in managing UTO.
Main Methods:
- Utilizing diuresis-enhanced renography as a primary diagnostic modality for suspected UTO.
- Employing pressure flow studies for equivocal renography results prior to surgical intervention.
- Establishing clear diagnostic criteria based on radioisotope excretion patterns pre- and post-furosemide administration.
Main Results:
- Diuresis-enhanced renography provides definitive diagnosis in clearly nonobstructed or obstructed systems.
- Pressure flow studies are crucial for resolving equivocal findings from renography.
- The technique is highly effective for monitoring disease progression and assessing surgical outcomes.
Conclusions:
- A systematic approach incorporating diuresis-enhanced renography is essential for accurate diagnosis and management of pediatric UTO.
- Interpreting renography results requires understanding specific excretion patterns.
- Pressure flow studies serve as a critical adjunct when renography is inconclusive, guiding treatment decisions.
Abstract:
Our approach to the evaluation and treatment of children with upper urinary tract obstruction is shown in Figure 10. The following guiding principles should be remembered: 1. Intravenous urography and renal ultrasonography are usually insufficient to establish the diagnosis of obstruction in an asymptomatic patient. 2. Diuresis-enhanced renography is diagnostic in nonobstructed systems (spontaneous excretion of the radioisotope before the injection of furosemide) or unequivocally obstructed systems (no excretion of the radioisotope after injection of furosemide). 3. If the results of diuresis-enhanced renography are equivocal, a patient should be evaluated by pressure flow studies before surgical correction is undertaken or a diagnosis of no obstruction. 4. Diuresis-enhanced renography is extremely useful in followup and in evaluating surgical results.