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The rim nephrogram in renovascular compromise

T C Demos, K Gadwood, L Love

    Urologic Radiology
    |January 1, 1982
    PubMed
    Summary
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    The cortical rim nephrogram, a sign of kidney underperfusion, indicates acute renal artery issues. This finding highlights the importance of collateral capsular vessels in maintaining renal cortex blood supply.

    Area of Science:

    • Nephrology
    • Radiology
    • Vascular Imaging

    Background:

    • The nephrogram is a key indicator of renovascular compromise.
    • Cortical rim nephrogram is an uncommon but distinct finding on kidney imaging.
    • This sign visualizes a thin nephrographic rim around a kidney with a faint overall nephrogram.

    Observation:

    • Two patients presented with a cortical rim nephrogram following acute renal artery insult.
    • This specific nephrographic pattern suggests significant underperfusion of the kidney.
    • The phenomenon relies on collateral capsular vessels supplying the outer renal cortex.

    Findings:

    • The cortical rim nephrogram reliably indicates reduced blood flow to the kidney.
    • Underperfusion may stem from primary renal artery issues or secondary causes like increased interstitial pressure.

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  • This sign has not been previously associated with systemic circulatory problems.

    • Implications:

    • The cortical rim nephrogram serves as a crucial diagnostic marker for acute kidney underperfusion.
    • Understanding this sign aids in diagnosing and managing conditions affecting renal artery perfusion.
    • Further research may elucidate the full clinical significance of the cortical rim nephrogram in various renal pathologies.