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Comparative Histopathologic Analysis of Inner Ear Damage in Meningitis: Otogenic Versus Meningogenic Routes.

Artur K Schuster¹, Nevra K Yilmaz^2,3, Tomotaka Shimura^2,4

¹Postgraduate Program in Medicine: Surgical Sciences, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil.

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|September 12, 2024

Summary

Distinguishing inner ear changes in meningitis helps identify infection routes. Otogenic meningitis shows more ossification and spiral ligament damage, while meningogenic meningitis causes greater vestibular hair cell loss.

Keywords:

human temporal bone labyrinthitis meningitis otopathology

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Area of Science:

Otolaryngology
Neurology
Pathology

Background:

Meningitis can affect the inner ear through otogenic (ear origin) or meningogenic (meningeal origin) routes.
Understanding distinct pathological patterns associated with each route is crucial for diagnosis and treatment.

Purpose of the Study:

To differentiate inner ear histopathological changes based on the route of meningitis infection.
To establish patterns that can aid in developing diagnostic strategies and targeted therapies for meningitis-induced labyrinthitis.

Main Methods:

Histopathological examination of temporal bones from patients with meningitis and labyrinthitis.
Categorization into otogenic and meningogenic groups.
Assessment of inflammation, ossification, hair cell loss, and specific anatomical structures (cochlear aqueduct, vestibular aqueduct, etc.).

Main Results:

Otogenic cases showed more generalized labyrinthitis and exclusively early cochlear ossification.
Spiral ligament fibrocytes were uniformly lost in otogenic cases, versus apical loss in meningogenic.
Otogenic cases had more severe cochlear aqueduct/endolymphatic sac inflammation; meningogenic cases had more vestibular hair cell loss.

Conclusions:

Otogenic meningitis is associated with spiral ligament changes and ossification, while meningogenic meningitis leads to greater vestibular damage.
Identifying the infection route is vital for accurate diagnosis and developing pathology-specific treatments for inner ear complications of meningitis.