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Related Experiment Videos

Psoas muscle disorders: MR imaging.

J K Lee, H S Glazer

    Radiology
    |September 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Magnetic resonance (MR) imaging effectively visualizes psoas muscle abnormalities, offering superior contrast over computed tomography (CT) in most cases. T2-weighted sequences enhance detection of these diverse psoas conditions.

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    Area of Science:

    • Radiology
    • Medical Imaging
    • Musculoskeletal Imaging

    Background:

    • Psoas and iliopsoas abnormalities can arise from various pathologies, including metastases, lymphoma, hematoma, and abscess.
    • Computed tomography (CT) is often the initial imaging modality for detecting these abnormalities.
    • Magnetic resonance (MR) imaging offers advanced soft-tissue contrast for detailed anatomical assessment.

    Purpose of the Study:

    • To evaluate the utility of MR imaging in characterizing psoas and iliopsoas abnormalities initially detected by CT.
    • To compare the diagnostic performance of MR imaging versus CT in visualizing psoas muscle pathology.

    Main Methods:

    • Nineteen patients with CT-diagnosed psoas/iliopsoas abnormalities underwent MR imaging.
    • Both T1- and T2-weighted spin-echo sequences were utilized for image acquisition.

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  • Abnormalities were analyzed for patterns of muscle involvement: total replacement, lateral, or medial displacement.

    • Main Results:

    • MR imaging identified abnormal psoas muscles on both T1- and T2-weighted images, with T2-weighted sequences providing better contrast.
    • MR imaging revealed that apparent psoas enlargement on CT was due to lateral displacement by paraspinal masses in four patients.
    • MR provided superior contrast compared to CT in nine cases; CT was better in two cases due to calcifications and air bubbles.

    Conclusions:

    • MR imaging is a valuable tool for evaluating psoas and iliopsoas abnormalities, offering enhanced visualization of muscle pathology.
    • T2-weighted MR sequences are particularly useful for delineating the extent and nature of psoas muscle involvement.
    • While MR excels in soft-tissue contrast, CT may remain superior for detecting calcifications and intraparenchymal air within abscesses.