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Surgical Labyrinthectomy of the Rat to Study the Vestibular System

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Large vestibular aqueduct syndrome: a human temporal bone study.

Shigeo Hirai¹, Sebahattin Cureoglu, Patricia A Schachern

¹International Hearing Foundation, Minneapolis, Minnesota, USA. shigeo-hirai@hotmail.com

The Laryngoscope

|November 1, 2006

Summary

Large vestibular aqueduct syndrome (LVAS) is a common cause of hearing loss. This study found LVAS in 63 of 1,608 temporal bones, often associated with congenital heart defects and inner ear anomalies.

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Area of Science:

Otolaryngology
Genetics
Pathology

Background:

Large vestibular aqueduct syndrome (LVAS) is a significant cause of hearing loss (HL).
Previous research identified various anomalies associated with LVAS using imaging.
This study aimed to determine LVAS prevalence in temporal bone (TB) collections and its associated anomalies.

Purpose of the Study:

To establish the prevalence of LVAS within a temporal bone collection.
To investigate the relationship between LVAS and other systemic or otologic anomalies.
To correlate histopathological findings with LVAS.

Main Methods:

A retrospective analysis of temporal bone histopathology was conducted.
Measurements of internal (IA) and external (EA) aperture diameters defined LVA, with 95% greater than normal considered enlarged.
Systemic, otologic anomalies, and histopathology of ears with LVAS were documented.

Main Results:

LVAS was identified in 63 out of 1,608 non-normal temporal bones.
Enlarged EA always accompanied enlarged IA, defining LVAS.
Congenital heart anomaly was the most frequent associated condition, followed by Mondini's dysplasia, and various external/middle ear anomalies.

Conclusions:

Hearing loss in LVAS may stem from co-occurring inner ear anomalies.
Further investigation of inner ear issues and systemic diagnoses is crucial for patients with radiologically diagnosed LVAS.
Identifying associated syndromes is important for comprehensive patient management.