Mastoiditis MRI: Difference between revisions
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==MRI== | ==MRI== | ||
On [[MRI]] scan of the head, orbital cellulitis is characterized by hypointense signal on [[T1 relaxography|T1]]-weighted images, and hyperintense signal on T2-weighted images.<sup>[[Orbital cellulitis MRI#cite note-radiopaedia-1|[1]]]</sup> [[MRI]] has demonstrated equivilance to [[CT]] in diagnosing [[orbital disease]] and is equally accepted as a [[Gold standard (test)|gold standard]] diagnostic imaging modality.<sup>[[Orbital cellulitis MRI#cite note-pmid19696266-2|[2]]][[Orbital cellulitis MRI#cite note-merckmanualorbitalcellulitis-3|[3]]]</sup> Although an [[MRI]] scan is safer in children since there is no [[radiation]] exposure, the long acquisition time and the need for prolonged sedation make [[CT]] scan the imaging modality of choice.<sup>[[Orbital cellulitis MRI#cite note-eyewikiorbitalcellulitis-4|[4]]]</sup> After a diagnosis is made, [[MRI]] has shown superiority in assessing the severity of intracranial involvement and [[abscess]] border visualization | On [[MRI]] scan of the head, orbital cellulitis is characterized by hypointense signal on [[T1 relaxography|T1]]-weighted images, and hyperintense signal on T2-weighted images.<ref name="urlMiddle ear | Radiology Reference Article | Radiopaedia.org">{{cite web |url=http://radiopaedia.org/articles/middle-ear |title=Middle ear | Radiology Reference Article | Radiopaedia.org |format= |work= |accessdate=}}</ref><sup>[[Orbital cellulitis MRI#cite note-radiopaedia-1|[1]]]</sup> [[MRI]] has demonstrated equivilance to [[CT]] in diagnosing [[orbital disease]] and is equally accepted as a [[Gold standard (test)|gold standard]] diagnostic imaging modality.<sup>[[Orbital cellulitis MRI#cite note-pmid19696266-2|[2]]][[Orbital cellulitis MRI#cite note-merckmanualorbitalcellulitis-3|[3]]]</sup> Although an [[MRI]] scan is safer in children since there is no [[radiation]] exposure, the long acquisition time and the need for prolonged sedation make [[CT]] scan the imaging modality of choice.<sup>[[Orbital cellulitis MRI#cite note-eyewikiorbitalcellulitis-4|[4]]]</sup> After a diagnosis is made, [[MRI]] has shown superiority in assessing the severity of intracranial involvement and [[abscess]] border visualization | ||
* partial-to-complete opacification of the mastoid air cells +/- middle ear cleft | * partial-to-complete opacification of the mastoid air cells +/- middle ear cleft | ||
* fluid signal intensity in the mastoid should not be interpreted as mastoiditis without other evidence, such as mucosal contrast enhancement and/or diffusion restriction | * fluid signal intensity in the mastoid should not be interpreted as mastoiditis without other evidence, such as mucosal contrast enhancement and/or diffusion restriction | ||
* | * | ||
==References== | ==References== | ||
Revision as of 16:41, 28 June 2017
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
Overview
MRI
On MRI scan of the head, orbital cellulitis is characterized by hypointense signal on T1-weighted images, and hyperintense signal on T2-weighted images.[1][1] MRI has demonstrated equivilance to CT in diagnosing orbital disease and is equally accepted as a gold standard diagnostic imaging modality.[2][3] Although an MRI scan is safer in children since there is no radiation exposure, the long acquisition time and the need for prolonged sedation make CT scan the imaging modality of choice.[4] After a diagnosis is made, MRI has shown superiority in assessing the severity of intracranial involvement and abscess border visualization
- partial-to-complete opacification of the mastoid air cells +/- middle ear cleft
- fluid signal intensity in the mastoid should not be interpreted as mastoiditis without other evidence, such as mucosal contrast enhancement and/or diffusion restriction