The large vestibular aqueduct syndrome.

Area of Science:

• Otolaryngology
• Radiology
• Neuroscience

Background:

• The vestibular aqueduct's size is a key indicator in inner ear development.
• Enlargement of the vestibular aqueduct can be associated with congenital hearing loss.
• Understanding its anatomy and embryology is crucial for diagnosing inner ear anomalies.

Purpose of the Study:

• To evaluate the radiographic appearance of the vestibular aqueduct in a large patient cohort.
• To characterize the clinical presentation and functional deficits associated with a large vestibular aqueduct.
• To correlate imaging findings with audiometric and vestibular function tests.

Main Methods:

• Retrospective review of 2683 hypocycloidal polytomographic temporal bone studies (5366 ears).
• Identification of large vestibular aqueduct (LVA) defined as diameter > 1.5 mm.
• Audiometric and vestibular function testing in affected patients.

Main Results:

• Forty-seven ears (1%) in 26 patients exhibited a large vestibular aqueduct.
• The study provides a comprehensive review of embryology, anatomy, and physiology.
• Correlations between imaging and functional tests were established for LVA syndrome.

Conclusions:

• Large vestibular aqueduct is an uncommon finding but significant for audiological and vestibular assessment.
• Hypocycloidal polytomography and CT are valuable for diagnosing LVA.
• Further characterization of large vestibular aqueduct syndrome aids in patient management.