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Joseph Junewick, MD FACR
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Dilated Vestibular Aqueduct

Case Detail

Anatomy: Neck-Face
Joseph Junewick, MD FACR
Diagnostic Category: Developmental or Congenital
Created: over 11 years ago
Updated: over 9 years ago
Tags: PEDS
Modality/Study Types: CT
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8 month old female with hearing loss.

Case Images


Dilated Vestibular Aqueduct


CT – dilated and funneled vestibular aqueducts


Dilated vestibular aqueduct is a common etiology of neurosensory hearing loss. It is diagnosed when the transverse diameter is greater than or equal to 1.5 mm.

Vestibular aqueduct enlargement is related to abnormal development of the endolymphatic duct and sac. The vestibular aqueduct is an extension of the vestibular membranous labyrinth through the osseous vestibular aqueduct, ending in the endolymphatic sac between the 2 layers of dura along the petrous bone. Abnormalities of the membranous labyrinth are seen in most cases.

Occurence of vestibular aqueduct enlargement is usually sporadic but can be associated with Pendred syndrome, CMV infection, branchio-oto-renal syndrome and CHARGE syndrome.


Vijayasekaranb S, Halsteda MJ, Boston M, et al. When Is the Vestibular Aqueduct Enlarged? A Statistical Analysis of the Normative Distribution of Vestibular Aqueduct Size. American Journal of Neuroradiology (2007); 28:1133-1138.

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