Acoustic neuroma MRI: Difference between revisions
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:T1 | :T1 | ||
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*Slightly hypointense | *Slightly hypointense to the adjacent [[brain]] (63%) | ||
*Isointense | *Isointense to the adjacent [[brain]] (37%) | ||
*May contain hypointense cystic areas | *May contain hypointense [[Cyst|cystic]] areas | ||
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:T2 | :T2 | ||
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*Heterogeneously hyperintense | *[[Heterogeneous|Heterogeneously]] hyperintense to the adjacent [[brain]] | ||
*Cystic areas fluid intensity | *[[Cyst|Cystic]] areas [[fluid]] intensity | ||
*May have associated | *May have associated [[Tumor|peritumoral]] [[Arachnoid mater|arachnoid]] [[Cyst|cysts]] | ||
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| style="padding: 5px 5px; background: #DCDCDC;font-weight: bold" | | | style="padding: 5px 5px; background: #DCDCDC;font-weight: bold" | | ||
:T1 C+ (Gd) | :T1 C+ (Gd) | ||
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*Contrast enhancement is vivid | *[[Contrast medium|Contrast]] enhancement is vivid | ||
*But heterogeneous in larger tumors | *But [[heterogeneous]] in larger [[Tumor|tumors]] | ||
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Post-op MRI: Linear enhancement may not indicate tumor | Post-op [[Magnetic resonance imaging|MRI]]: Linear enhancement may not indicate [[tumor]]. But if there is [[Nodule (medicine)|nodular]] enhancement, suspect [[tumor]] recurrence which will necessitate follow-up [[Magnetic resonance imaging|MRI]]).<ref name="radio">Acoustic Schwannoma. Radiopedia(2015) http://radiopaedia.org/articles/acoustic-schwannoma Accessed on October 2 2015</ref> | ||
[[File:Intracanalicular_acoustic_schwannoma.jpg|thumb|none|200px|MRI showing Intracanalicular acoustic neuroma<ref>Image courtesy of Dr Frank Gaillard. [http://www.radiopaedia.org Radiopaedia] (original file [http://radiopaedia.org/cases/intracanalicular-acoustic-schwannoma here]).[http://radiopaedia.org/licence Creative Commons BY-SA-NC</ref>]] | [[File:Intracanalicular_acoustic_schwannoma.jpg|thumb|none|200px|[[Magnetic resonance imaging|MRI]] showing Intracanalicular acoustic neuroma<ref>Image courtesy of Dr Frank Gaillard. [http://www.radiopaedia.org Radiopaedia] (original file [http://radiopaedia.org/cases/intracanalicular-acoustic-schwannoma here]).[http://radiopaedia.org/licence Creative Commons BY-SA-NC</ref>]] | ||
[[File:Intrameatal vestibularis schwannoma.jpg|thumb|none|200px|MRI showing Intrameatal | [[File:Intrameatal vestibularis schwannoma.jpg|thumb|none|200px|[[Magnetic resonance imaging|MRI]] showing [[Internal auditory meatus|Intrameatal]] vestibular schwannoma<ref>Image courtesy of Dr. Roberto Schubert [http://www.radiopaedia.org Radiopaedia] (original file [http://radiopaedia.org/cases/intrameatal-vestibularis-schwannoma here]).[http://radiopaedia.org/licence Creative Commons BY-SA-NC</ref>]] | ||
==References== | ==References== | ||
Latest revision as of 18:00, 26 April 2019
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Acoustic neuroma Microchapters | |
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Diagnosis | |
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Treatment | |
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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 the definitive diagnostic test for acoustic neuroma and can identify tumors as small as 1-2 millimeter in diameter. On brain MRI, acoustic neuroma characterized by hypointense mass on T1-weighted MRI, and hyperintense mass on T2-weighted MRI.
MRI
- Gadolinium-enhanced magnetic resonance imaging (MRI) is the preferred diagnostic test for identifying acoustic neuromas and can identify tumors as small as 1-2 millimeter in diameter.[1][2]
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Post-op MRI: Linear enhancement may not indicate tumor. But if there is nodular enhancement, suspect tumor recurrence which will necessitate follow-up MRI).[3]
References
- ↑ E. P. Lin & B. T. Crane (2017). "The Management and Imaging of Vestibular Schwannomas". AJNR. American journal of neuroradiology. 38 (11): 2034–2043. doi:10.3174/ajnr.A5213. PMID 28546250. Unknown parameter
|month=ignored (help) - ↑ D. F. Wilson, R. S. Hodgson, M. F. Gustafson, S. Hogue & L. Mills (1992). "The sensitivity of auditory brainstem response testing in small acoustic neuromas". The Laryngoscope. 102 (9): 961–964. doi:10.1288/00005537-199209000-00001. PMID 1518359. Unknown parameter
|month=ignored (help) - ↑ Acoustic Schwannoma. Radiopedia(2015) http://radiopaedia.org/articles/acoustic-schwannoma Accessed on October 2 2015
- ↑ Image courtesy of Dr Frank Gaillard. Radiopaedia (original file here).[http://radiopaedia.org/licence Creative Commons BY-SA-NC
- ↑ Image courtesy of Dr. Roberto Schubert Radiopaedia (original file here).[http://radiopaedia.org/licence Creative Commons BY-SA-NC