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Computed tomography of the normal thymus

R L Baron, J K Lee, S S Sagel

    Radiology
    |January 1, 1982
    PubMed
    Summary
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    Normal thymus appearance on computed tomographic (CT) scans is crucial to avoid misdiagnosis. This study analyzed CT scans to define the thymus

    Area of Science:

    • Radiology
    • Medical Imaging
    • Anatomy

    Background:

    • The normal thymus can exhibit variations in size, shape, and density on computed tomographic (CT) scans.
    • Misinterpretation of the normal thymus as an abnormal mediastinal mass is a clinical concern.

    Purpose of the Study:

    • To determine the incidence and appearance of the normal thymus on CT scans.
    • To establish reference ranges for thymic visualization and characteristics across different age groups.

    Main Methods:

    • Analysis of 154 mediastinal CT scans from patients without active chest disease.
    • Utilized a fourth-generation CT scanner for image acquisition.
    • Evaluated thymic visualization, thickness, width, and density (attenuation values).

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    Main Results:

    • The thymus was visualized in 100% of patients under 30, 73% between 30-49, and 17% over 49 years.
    • Thymic thickness decreased with age; width showed variation within age groups.
    • Thymic density decreased with age, transitioning from muscle-like to fat-like attenuation.

    Conclusions:

    • Age-related changes in thymic size and density are evident on CT scans.
    • Understanding these variations is essential for accurate interpretation of mediastinal imaging.
    • CT findings of the normal thymus differ significantly across adult age groups.