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.

Key CT or MRI 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.
• Key CT findings in cases of malignant otitis externa include the following:
  • 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.