This is a "definite" case of Ménière disease according to the American Academy of Otolaryngology-Head and Neck Surgery Committee on Hearing and Equilibrium1 criteria. In addition, CT findings of severely narrowed or absent vestibular aqueduct openings on both sides are supportive.
See Yamane et al.2 for images and useful illustrations.
In contradistinction to these CT features, vestibular aqueducts can be enlarged (normally congenital) as a cause of hearing loss.