Optic nerve glioma MRI: Difference between revisions

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Revision as of 13:23, 13 October 2015

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [2]Associate Editor(s)-in-Chief: Simrat Sarai, M.D. [3]

Overview

On head and neck MRI, optic nerve glioma is characterized by isointense to hypointense mass on T1-weighted MRI, and hyperintense mass on T2-weighted MRI.

MRI

Radiographs no longer have any real role to play in the diagnosis of orbital masses, however if performed enlargement of the optic canal may be demonstrated if the tumor is not confined to the orbit. Additional findings of NF1 may also be visible. The diagnosis of optic nerve glioma is best made by magnetic resonance imaging (MRI), which allows visualization of the entire course of the optic nerve. MRI also delineates hypothalamic involvement more clearly than computed tomography (CT).

The MRI features of optic nerve glioma include:^[1]


MRI component	Features

T1	Enlargement, often iso to hypointense compared to the contralateral side
T2	Hyperintense centrally Low signal at the periphery representing the dura
T1 C+ (Gd)	enhancement is variable

Axial T1 MRI showing bilateral optic nerve glioma^[2]

Coronal T2 MRI showing bilateral optic nerve glioma^[2]

References

↑ Optic nerve glioma. Radiopedia(2015) http://radiopaedia.org/articles/optic-nerve-glioma Accessed on October 2 2015
↑ ^2.0 ^2.1 ^2.2 Image courtesy of Dr Frank Gaillard. Radiopaedia (original file [1]).[http://radiopaedia.org/licence Creative Commons BY-SA-NC

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[radio-1] Optic nerve glioma. Radiopedia(2015) http://radiopaedia.org/articles/optic-nerve-glioma Accessed on October 2 2015

[radio1-2] 2.0 ^2.1 ^2.2 Image courtesy of Dr Frank Gaillard. Radiopaedia (original file [1]).[http://radiopaedia.org/licence Creative Commons BY-SA-NC

[1]

[2]

@@ Line 15: / Line 15: @@
 |-
 | style="padding: 5px 5px; background: #DCDCDC; font-weight: bold" |
-:Grade 1
+:T1
 | style="padding: 5px 5px; background: #F5F5F5;" |
-*well differentiated or low grade – slow growing, less likely to spread
+*Enlargement, often iso to hypointense compared to the contralateral side
 |-
 | style="padding: 5px 5px; background: #DCDCDC;font-weight: bold" |
-:Grade 2
+:T2
 | style="padding: 5px 5px; background: #F5F5F5;" |
-*moderately well differentiated or moderate grade
+*Hyperintense centrally
+*Low signal at the periphery representing the dura
 |-
 | style="padding: 5px 5px; background: #DCDCDC;font-weight: bold" |
-:Grade 3
+:T1 C+ (Gd)
 | style="padding: 5px 5px; background: #F5F5F5;" |
-*poorly differentiated or high grade – tend to grow quickly, more likely to spread
+*enhancement is variable
-|-
-| style="padding: 5px 5px; background: #DCDCDC;font-weight: bold" |
-:Grade 4
-| style="padding: 5px 5px; background: #F5F5F5;" |
-*undifferentiated or high grade – tend to grow very quickly, likely to spread
 |-
 |}

Optic nerve glioma MRI: Difference between revisions

Revision as of 13:23, 13 October 2015

Overview

MRI

References

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