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The formation of dilute urine is a critical renal adaptation that maintains fluid balance, particularly during periods of high fluid intake. This process primarily involves the juxtamedullary nephrons. By adjusting the permeability of water and ions in response to physiological conditions, the kidneys can either conserve or excrete water, resulting in concentrated or dilute urine.
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Related Experiment Video

Updated: Jul 11, 2026

Point-of-Care Kidney and Genitourinary Ultrasound in Adults: Image Acquisition

Point-of-Care Kidney and Genitourinary Ultrasound in Adults: Image Acquisition

Published on: June 21, 2024

Reduction in renal size associated with complete ureteric duplication

M R Funston, H M Du Preez

|October 1, 1978

Summary

Ureteric duplication typically increases kidney size. However, this study presents rare cases where non-functioning upper moieties in duplex kidneys led to reduced renal size, challenging typical observations.

Area of Science:

Pediatric Radiology
Urology
Medical Imaging

Background:

Ureteric duplication is a common congenital anomaly.
It is typically associated with normal or enlarged renal size.
Non-functioning moieties can occur in duplex systems.

Observation:

Presents two rare cases of duplex kidneys.
Both cases feature a non-functioning upper moiety.
These kidneys exhibited reduced renal size, contrary to typical findings.

Findings:

Detailed radiologic features of reduced renal size in duplex systems are discussed.
The underlying causes for this size reduction are explored.
Post-micturition radiography is highlighted for diagnosing urinary tract infections in these cases.

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Implications:

Challenges the conventional understanding of renal size in ureteric duplication.
Highlights the importance of considering atypical presentations in pediatric urology.
Emphasizes the diagnostic value of specific imaging techniques in complex urinary tract anomalies.