Schwannoma MRI: Difference between revisions
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==MRI== | ==MRI== | ||
Schwannomas have fairly predictable signal characteristics | Schwannomas have fairly predictable signal characteristics <ref name="pmid29279723">{{cite journal| author=Rosahl S, Bohr C, Lell M, Hamm K, Iro H| title=Diagnostics and therapy of vestibular schwannomas - an interdisciplinary challenge. | journal=GMS Curr Top Otorhinolaryngol Head Neck Surg | year= 2017 | volume= 16 | issue= | pages= Doc03 | pmid=29279723 | doi=10.3205/cto000142 | pmc=5738934 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=29279723 }} </ref> <ref name="pmid29937853">{{cite journal| author=Zou J, Hirvonen T| title="Wait and scan" management of patients with vestibular schwannoma and the relevance of non-contrast MRI in the follow-up. | journal=J Otol | year= 2017 | volume= 12 | issue= 4 | pages= 174-184 | pmid=29937853 | doi=10.1016/j.joto.2017.08.002 | pmc=6002632 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=29937853 }} </ref>: | ||
* '''T1''': isointense or hypointense | * '''T1''': isointense or hypointense | ||
* '''T1 C+ (Gd)''': intense enhancement | * '''T1 C+ (Gd)''': intense enhancement | ||
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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 | ||
==References== | ==References== | ||
Revision as of 12:21, 22 October 2019
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Schwannoma Microchapters |
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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]:
- 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.