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Related Experiment Videos

Computed tomography of the optic chiasm

D L Daniels, V M Haughton, A L Williams

    Radiology
    |October 1, 1980
    PubMed
    Summary

    Computed tomography (CT) accurately distinguishes normal optic chiasm anatomy from chiasmal glioma. CT scans reveal distinct shapes and sizes, aiding in diagnosing this optic nerve tumor.

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    NeuroImage·2010

    Area of Science:

    • Radiology
    • Neuro-oncology
    • Ophthalmology

    Background:

    • The optic chiasm is a critical structure where optic nerves partially cross.
    • Accurate imaging is essential for diagnosing conditions affecting the optic chiasm, such as glioma.

    Purpose of the Study:

    • To characterize the normal anatomy of the optic chiasm using computed tomography (CT).
    • To differentiate normal optic chiasm morphology from that associated with chiasmal glioma.

    Main Methods:

    • Axial and coronal CT images were acquired using a CT/T 8800 scanner.
    • Imaging data included one cadaver, 41 healthy individuals, and six patients with suspected chiasmal glioma.
    • Measurements of chiasm size and shape were performed.

    Main Results:

    • Normal optic chiasms exhibited U- or boomerang shapes on axial views and U- or dumbbell shapes on coronal views.
    • Average normal chiasm dimensions were 1.8 cm (transverse) x 0.8 cm (anteroposterior) x 0.4 cm (vertical).
    • Chiasmal gliomas presented as globular masses, with a vertical dimension exceeding 0.6 cm.

    Conclusions:

    • Computed tomography provides accurate differentiation between normal and abnormal optic chiasm anatomy.
    • CT imaging is a valuable tool for diagnosing chiasmal glioma based on size and shape characteristics.

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