1-Are low grade astrocytoma.
2-Before age of 20 years.
3-Associated with type 1 neurofibromatosis, in addition to optic nerve meningioma especially when bilaterally.
4-CT= smooth fusiform enlargement of the optic nerve.
Nerve become tortuous.
No lucent track sign.
Look for intra cranial extension.
5-MRI findings:
T1=Low signal intensity.
T2=High signal intensity.
Homogenous enhancement.
No lucent track sign.
Intra cranial extension along optic pathway.
2-Before age of 20 years.
3-Associated with type 1 neurofibromatosis, in addition to optic nerve meningioma especially when bilaterally.
4-CT= smooth fusiform enlargement of the optic nerve.
Nerve become tortuous.
No lucent track sign.
Look for intra cranial extension.
5-MRI findings:
T1=Low signal intensity.
T2=High signal intensity.
Homogenous enhancement.
No lucent track sign.
Intra cranial extension along optic pathway.
 |
| MRI T1 with diffuse enlargement of left optic nerve |
 |
| Intense signaling of left optic nerve by T2 |
 |
| Homogenous enhancement with tortuocity of the nerve. |
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