Schwannoma MRI: Difference between revisions
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** rarely seen intracranially 7 | ** rarely seen intracranially 7 | ||
* fascicular sign: multiple small ring-like structures | * fascicular sign: multiple small ring-like structures | ||
[[File:Schwannoma MRI.gif|400px|MR image of left sided vestibular schwannoma. Yellow dotted line is border between intra- and extrameatal portion of the tumour. Size quantified as the largest diameter measurable in the extrameatal portion (red line), Kleijwegt MC, van der Mey AG, Wiggers-deBruine FT, Malessy MJ, van Osch MJ. Perfusion magnetic resonance imaging provides additional information as compared to anatomical imaging for decision-making in vestibular schwannoma. Eur J Radiol Open. 2016;3:127–133. Published 2016 Jun 15. doi:10.1016/j.ejro.2016.05.005,https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4919314/]] | |||
==References== | ==References== | ||
Revision as of 13:51, 23 October 2019
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Schwannoma MRI On the Web |
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American Roentgen Ray Society Images of Schwannoma MRI |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: ; Maneesha Nandimandalam, M.B.B.S.[2]
Overview
MRI
Schwannomas have fairly predictable signal characteristics [1] [2][3][4] [5]:
- T1: isointense or hypointense
- T1 C+ (Gd): intense enhancement
- T2: heterogeneously hyperintense (Antoni A: relatively low, Antoni B: high)
- cystic degenerative areas may be present, especially in larger tumors
- T2*: larger tumors often have areas of hemosiderin
A number of signs can also be useful:
- split-fat sign: thin peripheral rim of fat best seen on planes along long axis of the lesion in non-fat-suppressed sequences
- target sign
- peripheral high T2 signal
- central low signal
- rarely seen intracranially 7
- fascicular sign: multiple small ring-like structures
References
- ↑ Rosahl S, Bohr C, Lell M, Hamm K, Iro H (2017). "Diagnostics and therapy of vestibular schwannomas - an interdisciplinary challenge". GMS Curr Top Otorhinolaryngol Head Neck Surg. 16: Doc03. doi:10.3205/cto000142. PMC 5738934. PMID 29279723.
- ↑ Zou J, Hirvonen T (2017). ""Wait and scan" management of patients with vestibular schwannoma and the relevance of non-contrast MRI in the follow-up". J Otol. 12 (4): 174–184. doi:10.1016/j.joto.2017.08.002. PMC 6002632. PMID 29937853.
- ↑ Jeong KH, Choi JW, Shin JE, Kim CH (2016). "Abnormal Magnetic Resonance Imaging Findings in Patients With Sudden Sensorineural Hearing Loss: Vestibular Schwannoma as the Most Common Cause of MRI Abnormality". Medicine (Baltimore). 95 (17): e3557. doi:10.1097/MD.0000000000003557. PMC 4998729. PMID 27124066.
- ↑ Kleijwegt MC, van der Mey AG, Wiggers-deBruine FT, Malessy MJ, van Osch MJ (2016). "Perfusion magnetic resonance imaging provides additional information as compared to anatomical imaging for decision-making in vestibular schwannoma". Eur J Radiol Open. 3: 127–33. doi:10.1016/j.ejro.2016.05.005. PMC 4919314. PMID 27366777.
- ↑ Lin EP, Crane BT (2017). "The Management and Imaging of Vestibular Schwannomas". AJNR Am J Neuroradiol. 38 (11): 2034–2043. doi:10.3174/ajnr.A5213. PMC 5690865. PMID 28546250.