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MRI findings and spreading patterns of necrotizing external otitis: is a poor outcome predictable?

B J Kwon1, M H Han, S H Oh

  • 1Department of Radiology, Seoul National University College of Medicine, and Clinical Research Institute, Seoul National University Hospital, South Korea.

Clinical Radiology
|May 23, 2006
PubMed
Abstract

Insights

Necrotizing external otitis (NEO) commonly affects retrocondylar fat and spreads through various pathways. Abnormal flow void and intracranial involvement, especially in the middle cranial fossa and foramen magnum, suggest a poor prognosis in NEO patients.

Area of Science:

  • Radiology
  • Otolaryngology
  • Infectious Diseases

Background:

  • Necrotizing external otitis (NEO) is a severe infection of the external auditory canal.
  • Understanding NEO spread patterns is crucial for predicting patient outcomes.
  • Magnetic resonance imaging (MRI) is a key diagnostic tool for evaluating NEO.

Purpose of the Study:

  • To evaluate the spreading patterns of necrotizing external otitis (NEO) using MRI.
  • To identify specific MRI-detected spreading patterns associated with poor patient outcomes.

Main Methods:

  • Retrospective review of initial and follow-up MRI scans from 14 NEO patients.
  • Patients were categorized into good and poor outcome groups.
  • Analysis of retrocondylar fat infiltration, abnormal internal carotid artery (ICA) flow voids, and five spreading patterns (medial, crossed, anterior, intracranial, combined).

Main Results:

  • Retrocondylar fat infiltration was observed in 93% of initial MRIs.
  • Abnormal ICA flow voids were present in 57% of poor outcome patients versus 0% in good outcome patients.
  • Intracranial spread, particularly to the middle cranial fossa and foramen magnum, was significantly more frequent in the poor outcome group (57% and 86%, respectively).

Conclusions:

  • NEO frequently involves retrocondylar fat and spreads to extracranial and intracranial compartments.
  • The presence of abnormal flow voids and intracranial dural enhancement, especially in the middle cranial fossa and foramen magnum, are indicators of a poor prognosis in NEO.

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