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Brain radiation lesions: MR imaging.

G C Dooms, S Hecht, M Brant-Zawadzki

    Radiology
    |January 1, 1986
    PubMed
    Summary
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    Magnetic resonance (MR) imaging is sensitive in detecting brain radiation lesions. However, MR cannot reliably differentiate between recurrent tumors and radiation necrosis, similar to computed tomography (CT).

    Area of Science:

    • Radiology
    • Neuroimaging
    • Radiation Oncology

    Background:

    • Radiation therapy for brain conditions can cause post-treatment changes.
    • Distinguishing these changes from tumor recurrence is clinically significant.

    Purpose of the Study:

    • To evaluate magnetic resonance (MR) imaging's ability to detect and characterize brain radiation lesions.
    • To compare MR findings with computed tomography (CT) in patients post-radiation therapy.

    Main Methods:

    • Retrospective review of MR images from 55 patients who received brain radiation therapy.
    • Comparative analysis with available CT studies, using normal white matter as a reference.
    • Assessment of signal intensities and relaxation times (T1 and T2) in radiation lesions.

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    Main Results:

    • MR imaging detected radiation lesions in 8 patients as high signal intensity regions on long repetition time sequences.
    • Prolonged T1 and T2 relaxation times were observed in these lesions.
    • MR imaging missed one case of subependymal tumor spread masked by radiation effects; both MR and CT failed to distinguish tumor recurrence from radiation necrosis.

    Conclusions:

    • MR imaging demonstrates high sensitivity for depicting brain radiation lesions.
    • MR imaging is limited in differentiating radiation necrosis from recurrent or residual brain tumors, a limitation shared with CT.