The vestibulocochlear nerve: aplasia and hypoplasia in combination with inner ear malformations.
Eur Radiol
; 22(3): 519-24, 2012 Mar.
Article
em En
| MEDLINE
| ID: mdl-21960158
ABSTRACT
OBJECTIVE:
To determine features of hypoplasia and aplasia of the vestibulocochlear nerve (VCN) in combination with inner ear malformations (IEMs).METHODS:
Index cases were retrospectively selected from all IEMs collected since 1995. CT and MRI data were reviewed by two neuroradiologists. The number and thickness of visible nerves in the cerebellopontine angle cistern and inside the internal auditory canal (IAC) were analysed.RESULTS:
MR images for 176 patients with IEMs were analysed. Labyrinthine aplasia and otocyst deformity showed 100% correlation, and IAC malformations exhibited 92% correlation with VCN aplasia. Cochlear aplasia, complete aplasia of the semicircular canals, severe cochlear hypoplasia, common cavity, incomplete partition type 1 and mild cochlear hypoplasia showed decreasing degrees of correlation with hypoplasia of the VCN. The remaining types of IEM did not demonstrate VCN hypoplasia.CONCLUSIONS:
Certain forms of IEM show 100% correlation with hypoplasia or aplasia of the VCN, while others correlate less strongly and some do not usually exhibit VCN hypoplasia. MRI should always be carried out for those forms often correlated with VCN hypoplasia. KEY POINTS Vestibulocochlear nerve deficiency can be strongly suspected in certain inner ear malformations ⢠Bony cochlear aplasia and cochlear nerve aplasia are strongly correlated ⢠In semicircular canal aplasia, hypoplasia of the vestibular nerve can be found ⢠Before cochlear implantation, the type of any IEM should be fully understood.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Nervo Vestibulococlear
/
Orelha Interna
Tipo de estudo:
Observational_studies
Limite:
Child
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Eur Radiol
Assunto da revista:
RADIOLOGIA
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Alemanha