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Intrathecal Application of a Fluorescent Dye for the Identification of Cerebrospinal Fluid Leaks in Cochlear Malformation

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Histopathological Factors Contributing to Recurrent Meningitis in Inner Ear Malformations.

Levent Sennaroglu¹, Mounika Naidu Boya², Miriam I Redleaf

¹Department of Otolaryngology, Hacettepe University Faculty of Medicine, Ankara, Turkey.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology

|July 22, 2025

Summary

Inner ear malformations (IEMs) can lead to recurrent meningitis via stapes footplate fistulas or deficient otic capsules. These defects create direct infection pathways, often resulting in fatal outcomes despite treatment.

Keywords:

Deficient otic capsule Histopathology Inner ear malformations Recurrent meningitis Stapes footplate fistula

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Last Updated: May 5, 2026

Intrathecal Application of a Fluorescent Dye for the Identification of Cerebrospinal Fluid Leaks in Cochlear Malformation

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Published on: February 29, 2020

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Cryosectioning and Immunostaining Mouse Inner Ear Tissue: From Embryonic to Adult Stages

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Published on: April 11, 2025

Area of Science:

Otopathology
Neuroscience
Infectious Diseases

Background:

Recurrent meningitis poses a significant threat, particularly in individuals with inner ear malformations (IEMs).
Understanding the specific histopathological factors that facilitate recurrent meningitis in IEMs is crucial for effective management.

Purpose of the Study:

To analyze the histopathological factors contributing to recurrent meningitis in patients with inner ear malformations (IEMs).
To elucidate the anatomical defects and infection pathways involved in recurrent meningitis associated with IEMs.

Main Methods:

Histopathological examination of archived human temporal bone specimens from two cases with documented IEMs and recurrent meningitis.
Analysis focused on identifying specific anatomical defects and potential routes of infection spread.

Main Results:

Case 1: Incomplete partition type I (IP-I) with a stapes footplate fistula provided a direct middle-to-inner ear infection pathway.
Case 2: Incomplete partition type III (IP-III) with a deficient otic capsule presented multiple infection routes.
Both cases experienced fatal meningitis despite medical interventions.

Conclusions:

Recurrent meningitis in IEMs arises from distinct pathophysiological mechanisms, including stapes footplate fistulas and deficient otic capsules.
Management requires tailored strategies, such as surgical repair for fistulas and subtotal petrosectomy for deficient capsules.
Preventive measures like vaccination and careful surgical planning are essential.