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The retropsoas recess. Demonstration using computed tomography.

R B Kelly, P D Mahoney, M P Frick

    Investigative Radiology
    |July 1, 1987
    PubMed
    Summary
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    A retropsoas recess, a normal anatomical variant where bowel loops extend behind the psoas muscle, occurs in 4.4% of individuals. This finding is often linked to reduced retroperitoneal fat.

    Area of Science:

    • Radiology
    • Anatomy
    • Gastroenterology

    Background:

    • The space posterior to the psoas muscle typically contains retroperitoneal fat.
    • A retropsoas recess is a newly described normal anatomical variant.

    Purpose of the Study:

    • To report the occurrence and characteristics of the retropsoas recess.
    • To identify predisposing factors and potential diagnostic challenges.

    Main Methods:

    • Retrospective review of 250 consecutive abdominal CT examinations.
    • Analysis of cases with bowel loops posterior to the psoas muscle.

    Main Results:

    • 11 cases (4.4%) demonstrated a retropsoas recess.
    • Occurrences were unilateral (7) or bilateral (4).

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  • A paucity of retroperitoneal fat was the main predisposing factor.

    • Conclusions:

    • The retropsoas recess is a normal variant, primarily associated with reduced retroperitoneal fat.
    • It can mimic retroperitoneal masses or abscesses on CT scans.
    • Awareness is crucial for interventional procedures involving this anatomical region.