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9 Modern Concepts in Orbital Imaging |
a |
b |
9
Fig. 9.28 (a) A-scan of an optic nerve glioma showing a low reflective widening of the nerve shadow (on). (b) B-scan of an optic nerve glioma; the optic nerve shadow shows low reflectivity with more highly reflective foci of calcification
features of size and location as well as on quantitative properties.
9.7.3Optic Nerves
Lesions of the optic disc and disorders of the retrobulbar optic nerve are well suited for evaluation with echography. B-scan is the method of choice to evaluate the optic disc and demonstrates gross abnormalities of the retrobulbar optic nerve in the anterior orbit. B-scan can easily demonstrate gross enlargement of the optic nerve just behind the eye as well as heterogeneous echoes such as calcification that may provide important clues to aid in differentiation (Fig. 9.28).
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