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Ultrasonographic unilateral hydronephrosis with bladder outlet obstruction
1Nephrology Service, Brooke Army Medical Center, Fort Sam Houston, Texas 08234-6200.
Clinical Nephrology
|November 1, 1994
Summary
Renal ultrasonography can miss obstructive uropathy in azotemic patients. Always check for asymmetrical kidney function, especially when ultrasound findings are atypical, to ensure accurate diagnosis.
Area of Science:
- Nephrology
- Radiology
- Urology
Background:
- Renal ultrasonography is a key tool for evaluating azotemic patients.
- Understanding its limitations is vital for diagnosing obstructive uropathy.
- Atypical presentations can challenge diagnostic accuracy.
Observation:
- Two cases revealed unilateral hydronephrosis on screening ultrasound, masking lower urinary tract obstruction.
- In both cases, hydronephrosis occurred in the better-functioning kidney.
- Significant asymmetry in renal function was noted.
Findings:
- Screening renal ultrasonography may not always detect obstructive uropathy.
- Hydronephrosis can be present in the non-obstructed, better-functioning kidney.
- Asymmetrical renal function is a critical factor in atypical ultrasound findings.
Implications:
- Clinicians must consider asymmetrical renal function in azotemic patients with unusual ultrasound results.
- Further investigation is warranted even with normal or minimally abnormal renal ultrasounds if suspicion for obstructive uropathy is high.
- Integrating functional assessment with imaging improves diagnostic sensitivity for obstructive uropathy.