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.<ref name="urlMiddle ear | Radiology Reference Article | Radiopaedia.org">{{cite web |url=http://radiopaedia.org/articles/middle-ear |title=Middle ear &#124; Radiology Reference Article &#124; 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
MRI in mastoiditis plays role in the detection of cholesteatoma, also when intracranial and some intratemporal complications are suspected. Specifically, [[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
Both CT and MRI are used in the evaluation of COM and its complications. Although, HRCT is the best tool to evaluate ossicular chain and tympanic cavity walls and mastoid itself, however, CT is unable to differentiate between different types of effusions in the tympanic cavity, also evaluation of cholesteatoma can be challenging.
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Revision as of 17:49, 28 June 2017

Mastoiditis Microchapters

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:

Overview

MRI

MRI in mastoiditis plays role in the detection of cholesteatoma, also when intracranial and some intratemporal complications are suspected. Specifically, MRI has shown superiority in assessing the severity of intracranial involvement and abscess border visualization.

Both CT and MRI are used in the evaluation of COM and its complications. Although, HRCT is the best tool to evaluate ossicular chain and tympanic cavity walls and mastoid itself, however, CT is unable to differentiate between different types of effusions in the tympanic cavity, also evaluation of cholesteatoma can be challenging.

References

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