Acoustic neuroma MRI: Difference between revisions
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==Overview== | ==Overview== | ||
Gadolinium-enhanced MRI scan is diagnostic of Acoutic neuroma. On brain MRI, glioblastoma is characterized by hypointense mass on T1-weighted MRI and hyperintense mass on T2-weighted MRI | |||
==MRI== | |||
Magnetic resonance imaging (MRI) using Gadolinium as an enhancing contrast material is the preferred diagnostic test for identifying acoustic neuromas. The image formed clearly defines an acoustic neuroma if it is present and this technique can identify tumors measuring only a few millimeters in diameter. Tumors as small as 1-2 mm in diameter can be demonstrated by well performed MRI scanning. Nonenhanced MRI can miss small tumors. | |||
MRI findings of Acoustic neuroma are: | MRI findings of Acoustic neuroma are: | ||
'''T1''' | '''T1''' | ||
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'''T1 C+ (Gd)''' | '''T1 C+ (Gd)''' | ||
*Contrast enhancement is vivid | *Contrast enhancement is vivid | ||
*But heterogeneous in larger | *But heterogeneous in larger tumors | ||
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! style="background: #4479BA; width: 200px;" | {{fontcolor|#FFF|MRI component}} | |||
! style="background: #4479BA; width: 400px;" | {{fontcolor|#FFF|Features}} | |||
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:T1 | |||
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*Slightly hypointense cf. adjacent brain (63%) | |||
*Isointense cf. adjacent brain (37%) | |||
*May contain hypointense cystic areas | |||
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:T2 | |||
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*Heterogeneously hyperintense cf. to adjacent brain | |||
*Cystic areas fluid intensity | |||
*May have associated peritumoural arachnoid cysts | |||
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| style="padding: 5px 5px; background: #DCDCDC;font-weight: bold" | | |||
:T1 C+ (Gd) | |||
| style="padding: 5px 5px; background: #F5F5F5;" | | |||
*Contrast enhancement is vivid | |||
*But heterogeneous in larger tumors | |||
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Post-up MRI:Linear enhancement may not indicate tumour, but if there is nodular enhancement suspect tumour recurrence (needs follow up MRI). | Post-up MRI:Linear enhancement may not indicate tumour, but if there is nodular enhancement suspect tumour recurrence (needs follow up MRI). | ||
Revision as of 13:28, 18 September 2015
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Acoustic neuroma Microchapters | |
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Diagnosis | |
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Treatment | |
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Case Studies | |
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Acoustic neuroma MRI On the Web | |
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American Roentgen Ray Society Images of Acoustic neuroma MRI | |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Simrat Sarai, M.D. [2]
Overview
Gadolinium-enhanced MRI scan is diagnostic of Acoutic neuroma. On brain MRI, glioblastoma is characterized by hypointense mass on T1-weighted MRI and hyperintense mass on T2-weighted MRI
MRI
Magnetic resonance imaging (MRI) using Gadolinium as an enhancing contrast material is the preferred diagnostic test for identifying acoustic neuromas. The image formed clearly defines an acoustic neuroma if it is present and this technique can identify tumors measuring only a few millimeters in diameter. Tumors as small as 1-2 mm in diameter can be demonstrated by well performed MRI scanning. Nonenhanced MRI can miss small tumors.
MRI findings of Acoustic neuroma are: T1
- Slightly hypointense cf. adjacent brain (63%)
- Isointense cf. adjacent brain (37%)
- May contain hypointense cystic areas
T2
- Heterogeneously hyperintense cf. to adjacent brain
- Cystic areas fluid intensity
- May have associated peritumoural arachnoid cysts
T1 C+ (Gd)
- Contrast enhancement is vivid
- But heterogeneous in larger tumors
| MRI component | Features |
|---|---|
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Post-up MRI:Linear enhancement may not indicate tumour, but if there is nodular enhancement suspect tumour recurrence (needs follow up MRI).