Enlarged vestibular aqueduct

Case contributed by Roberto Schubert
Diagnosis certain

Presentation

Patient with hearing loss, previously diagnosed with an "arachnoid cyst".

Patient Data

Age: 25 years
Gender: Female
mri

Massive enlargement of the left vestibular aqueduct (which contains the endolymphatic duct and sac). The other fluid-filled structures of the inner ear seem normal.

Case Discussion

Enlargement of the vestibular aqueduct and its contents is the most common component of congenital inner ear dysplasias. It is more often bilateral than unilateral and is associated with the Mondini malformation of the cochlea in about 8% of cases 1.

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