Otitis externa CT or MRI
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Luke Rusowicz-Orazem, B.S.
Overview
CT imaging is essential in establishing a diagnosis of malignant necrotizing otitis externa by revealing the extent of infection past the ear canal and spread into temporal and intracranial bones. They reveal the extent of damage and inflammation of the bones and soft tissue, demonstrating the cause for facial palsy due to the inflammatory influence on the cranial nerves.
Key CT Findings in Otitis Externa
- CT Imaging of malignant necrotizing otitis externa is essential in facilitating diagnosis by proving the extension of infection into the temporal or intracranial bones.[1]
- Key CT findings in cases of malignant otitis externa include the following:[2]
- Thickening and enhancing soft tissue in the region of the external auditory canal with or without formation of a phlegmon or abscess.
- In the case of an abscess, cartilaginous bonering enhancing collection(s) with a low attenuation (necrotic) center can be observed.
- The route of infection:
- Anteroinferiorly to involve the suprahyoid neck spaces.
- Direct intracranial spread, causing serious intracranial complications; this caused by erosion of the cartilaginous-bone in the external auditory canal.
- Destruction of temporal bones and opacified mastoid air cells.
- Destruction of the cortex of the mastoid.[3]
- Cause of facial palsy due to influence of inflammation on the cranial nerves.
- Thickening and enhancing soft tissue in the region of the external auditory canal with or without formation of a phlegmon or abscess.
References
- ↑ Handzel O, Halperin D (2003). "Necrotizing (malignant) external otitis". Am Fam Physician. 68 (2): 309–12. PMID 12892351.
- ↑ "Necrotising otitis externa | Radiology Reference Article | Radiopaedia.org".
- ↑ Curtin, H D; Wolfe, P; May, M (1982). "Malignant external otitis: CT evaluation". Radiology. 145 (2): 383–388. doi:10.1148/radiology.145.2.7134442. ISSN 0033-8419.