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Dilated renal collecting systems: differentiating obstructive from nonobstructive dilation using duplex Doppler
R O Bude1, J F Platt, J M Rubin
1Department of Diagnostic Radiology, University of Michigan Medical Center, Ann Arbor.
Urology
|February 1, 1991
Summary
Duplex sonography effectively identified dilated kidney collecting systems in patients with ileal loop urinary diversions. Resistive index measurements distinguished between obstructive and nonobstructive causes of dilation.
Area of Science:
- Nephrology
- Urology
- Medical Imaging
Background:
- Ileal loop urinary diversions can lead to upper urinary tract complications.
- Accurate assessment of renal collecting system dilation is crucial for patient management.
Observation:
- Real-time and Doppler sonography (duplex sonography) were used to examine the kidneys of two patients with ileal loop urinary diversions.
- Both patients presented with dilated intrarenal collecting systems.
Findings:
- Duplex sonography successfully visualized dilated intrarenal collecting systems in both cases.
- Resistive index measurements from Doppler signals differentiated between obstructive and nonobstructive dilatation.
- Obstructive dilatation was identified in one patient, while nonobstructive dilatation was noted in the other.
Implications:
- Duplex sonography, particularly with resistive index analysis, offers a valuable non-invasive method for evaluating renal collecting system status post-urinary diversion.
- This technique aids in distinguishing the cause of dilation, guiding appropriate clinical intervention.
- Further studies are warranted to confirm these findings in a larger cohort.