Optic Nerve

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Author:
zimmerk
ID:
218932
Filename:
Optic Nerve
Updated:
2013-05-10 11:16:46
Tags:
eye Ultrasound
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Description:
Ch. 16 Optic Nerve
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  1. List Retrobulbar Optic Nerve Abnormalities.
    • Increased subarachnoid fluid (e.g, pseudotumor cerebri),
    • Optic neuritis,
    • Glioma,
    • Optic nerve sheath meningioma,
    • Tumors,
    • Arachnoid cyst,
    • Compressive optic neuropathy,
    • Trauma,
    • Vascular occlusive disease,
    • Optic atrophy
  2. List Optic Disc Abnormalities.
    • Cupping,
    • Coloboma,
    • Elevation,
    • Drusen,
    • Pit
  3. What are the Differential Diagnostic characteristics of Increased subarachnoi fluid?
    • Variable Reflectivity,
    • Irregular internal structure,
    • Positive Thirty-Degree test
  4. What are the Differential Diagnostic characteristics of a Glioma?
    • Low-med Reflectivity,
    • Regular internal structure,
    • Negative Thirty-Degree test
  5. What are the Differential Diagnostic characteristics of a Meningioma?
    • Med-high Reflectivity,
    • Irregular internal structure,
    • Negative Thirty-Degree test
  6. What is the Thirty-Degree test?
    • A dynamic A-scan technique for differentiating ISAF from thickening of the optic nerve parenchyma or the perineural sheaths.
    • It's based on theĀ assumptionĀ that when the eye is turned, the optic nerve and its sheaths are stretched, thus distributing the increased subarachnoid fluid over a greater area.
    • When patients eye is turned 30 degrees, the optic nerve pattern will decrease in size.
    • The more fluid present the more it would decrease by (up to 30%)

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