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Postmeningitic labyrinthine ossification primarily affecting the semicircular canals

C Muren1, G Bredberg

  • 1Department of Radiology, Södersjukhuset, Ringvägen 52, S-118 83 Stockholm, Sweden.

European Radiology
|January 1, 1997
PubMed
Summary

Labyrinthine ossification, a bone growth in the inner ear, was observed in cochlear implant candidates. This process, potentially starting in the semicircular canals, can impact cochlear implant success.

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Area of Science:

  • Otolaryngology
  • Radiology
  • Pediatric Medicine

Background:

  • Cochlear implantation is a vital treatment for severe hearing loss.
  • Labyrinthine ossification can complicate cochlear implant surgery and affect outcomes.
  • Early detection of ossification is crucial for surgical planning.

Purpose of the Study:

  • To investigate the prevalence and characteristics of labyrinthine ossification in pediatric cochlear implant candidates.
  • To identify the potential starting point and progression patterns of ossification.
  • To emphasize the importance of including semicircular canals in radiologic assessments.

Main Methods:

  • Computed tomography (CT) scans were performed on six cochlear implant candidates, including three children.
  • The stages and distribution of labyrinthine ossification were analyzed.

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  • Causative organisms were identified in relevant cases.

    • Main Results:

    • Labyrinthine ossification was observed in all six candidates, with varying stages.
    • In four candidates, ossification was more advanced in the semicircular canals than the cochlea.
    • The ossifying process developed over 4-5 months in two children, showing asymmetry in four patients. Causative organisms included Hemophilus influenzae and Streptococcus pneumoniae.

    Conclusions:

    • Radiologic assessment for cochlear implant candidates must include the semicircular canals.
    • Ossification may initiate in the semicircular canals, preceding cochlear involvement.
    • Early identification of semicircular canal ossification can predict cochlear ossification and guide surgical intervention.