Cavernous angioma MRI: Difference between revisions

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{{Cavernous angioma}}
{{Cavernous angioma}}
{{CMG}}
{{CMG}}<nowiki>; {{AE}}[[User:Edzelco|Edzel Lorraine Co, D.M.D., M.D.]]
 
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==Overview==
==Overview==
Diagnosis is most commonly made accidentally by routine [[magnetic resonance imaging]] (MRI) screening, but not all MRI exams are created equal. It is paramount that the patient request a gradient-echo sequence in order to unmask small or punctate lesions which may otherwise remain undetected. These lesions are also more conspicuous on FLAIR imaging compared to standard T2 weighing. FLAIR imaging is different from Gradient sequences, rather, it is similar to T2 weighing but suppresses free-flowing fluid signal. Sometimes quiescent CCMs can be revealed as incidental findings during MRI exams ordered for other reasons.
[[Diagnosis]] can be made through [[incidental findings]] from [[magnetic resonance imaging]] ([[MRI]]) [[screening]]. A [[gradient-echo sequence]] should be utilized to unmask [[punctate lesions]] which can go undetected. These [[lesions]] are more visible on [[FLAIR imaging]] than on [[T2 weighing]]. As compared to T2 weighing, [[FLAIR imaging]] has more suppression of [[free-flowing fluid signals]].


==MRI==
==[[MRI]]==


*Popcorn-like, smoothly circumscribed, well-delineated complex lesions.  
*These [[lesions]] are usually described as [[popcorn-like]], smooth, [[well-circumscribed]] complex lesions.<ref name="pmid33091393">{{cite journal| author=Rafee S, Killeen RP, Tubridy N| title='Popcorn' in the Brain: A Cause for Confusion. | journal=Am J Med | year= 2021 | volume= 134 | issue= 2 | pages= 216-217 | pmid=33091393 | doi=10.1016/j.amjmed.2020.09.014 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=33091393  }} </ref>
*The core is formed by multiple foci of mixed signal intensities, which represents hemorrhage in various stages of evolution.
*There is a foci of [[mixed-signal intensities]] in the core, which signifies the presence of [[hemorrhage]] in different stages of evolution.
*The heterogeneous core typically is surrounded completely by a low-signal-intensity hemosiderin rim on T1-weighted images. The hypointensity of this rim becomes more prominent, or blooms, on T2-weighted and gradient-refocused images because of the magnetic susceptibility effects.
*On [[T1-weighted images]], there is a [[low-signal-intensity]] [[hemosiderin]] rim bordering the heterogeneous core.
*Smaller cavernous malformations may appear as focal hypointense nodules with both T1- and T2-weighted sequences. The small lesions are depicted more clearly and are more numerous on gradient-echo images because of the increased susceptibility effects of the sequences.
*[[Focal hypointense nodules]] are usually associated with smaller [[cavernous malformation lesions]] in both [[T1- and T2-weighted sequences]]. These small lesions become more evident in [[gradient-echo images]] due to  increased susceptibility effects of the sequences.


([http://www.radswiki.net Images courtesy of RadsWiki])
([http://www.radswiki.net Images courtesy of RadsWiki])


<gallery>
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Image:Cavernous-malformation-01.jpg|MRI: Cavernous malformation
File:Cavernous-malformation-01.jpg|MRI: Cavernous malformation
Image:Cavernous-malformation-02.jpg|MRI: Cavernous malformation
File:Cavernous-malformation-02.jpg|MRI: Cavernous malformation
</gallery>
</gallery>


<gallery>
<gallery>
Image:Cavernous-malformation-03.jpg|MRI: Cavernous malformation
File:Cavernous-malformation-03.jpg|MRI: Cavernous malformation
Image:Cavernous-malformation-04.jpg|MRI: Cavernous malformation
File:Cavernous-malformation-04.jpg|MRI: Cavernous malformation
</gallery>
</gallery>


<gallery>
<gallery>
Image:Cavernous-malformation-05.jpg|MRI: Cavernous malformation
File:Cavernous-malformation-05.jpg|MRI: Cavernous malformation
Image:Cavernous-malformation-06.jpg|MRI: Cavernous malformation
File:Cavernous-malformation-06.jpg|MRI: Cavernous malformation
Image:Cavernous-malformation-07.jpg|MRI: Cavernous malformation
File:Cavernous-malformation-07.jpg|MRI: Cavernous malformation
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Latest revision as of 13:39, 12 May 2022

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]<nowiki>; Associate Editor(s)-in-Chief: Edzel Lorraine Co, D.M.D., M.D.

Overview

Diagnosis can be made through incidental findings from magnetic resonance imaging (MRI) screening. A gradient-echo sequence should be utilized to unmask punctate lesions which can go undetected. These lesions are more visible on FLAIR imaging than on T2 weighing. As compared to T2 weighing, FLAIR imaging has more suppression of free-flowing fluid signals.

MRI

(Images courtesy of RadsWiki)

References

  1. Rafee S, Killeen RP, Tubridy N (2021). "'Popcorn' in the Brain: A Cause for Confusion". Am J Med. 134 (2): 216–217. doi:10.1016/j.amjmed.2020.09.014. PMID 33091393 Check |pmid= value (help).