Disabling vertigo and tinnitus caused by intrameatal compression of the anterior inferior cerebellar artery on the vestibulocochlear nerve
: a case report, surgical considerations and review of the literature.
Oculomotor, trochlear, trigeminal, abducens, facial, and vestibulocochlear nerve
palsies are well-recognised complications with the abducens nerve being the most commonly affected one.
If SNHL is present, MRI is usually the preferred study as it better assesses the vestibulocochlear nerve
[sup] thought hearing loss due to vestibulocochlear nerve
involvement seems to be unique for brucellosis and suggested electrophysiological studies (brainstem auditory-evoked potentials) should be performed more commonly to detect subclinical vestibulocochlear nerve
involvement, as it may assist in pointing toward the diagnosis of neurobrucellosis.
Bacterial otitis interna can lead to meningitis with bacteria spreading through the vestibulocochlear nerve
. (9) Occasionally, otitis media can progress to otitis interna and then to meningitis.
(10) The vestibulocochlear nerve
, pathway, and nuclei constitute the central vestibular system.
Radiology gives information regarding the type of malformation, additional pathologies in the middle ear and mastoid, and the presence or absence of the vestibulocochlear nerve
. There has been a debate about which of the two modalities, HRCT or MRI, should be used in the preoperative evaluation of candidates undergoing cochlear implantation.
In high-resolution T2-weighted images or CISS images, the normal facial nerve appears as a hypointense linear structure extending from the brainstem to the IAC, anterior to the vestibulocochlear nerve
, surrounded by T2 hyperintense cerebrospinal fluid (Figure 1).
and the facial nerve enter the temporal bone through the internal auditory canal.
Hence the Pathophysiology involves the inner ear component and/or Cochlear part of vestibulocochlear nerve
. Since sensorineural hearing loss was present only in higher frequency it can be argued that cochlear part of 8th cranial nerve is not affected.
The remaining material is organized by anatomy, with seven chapters focusing on the external auditory canal and pinna; the middle ear and mastoid; temporal bone vascular anatomy, anomalies, and disease, with an emphasis on pulsatile tinnitus; the inner ear and otodystrophics; temporal bone trauma; anatomy and development of the facial nerve; and the vestibulocochlear nerve
, with an emphasis on the normal and diseased internal auditory canal and cerebellopontine angle.
LOSS of hearing may be caused by an acoustic neuroma - a benign brain tumour that grows around the vestibulocochlear nerve
in the head, which controls hearing and balance.
However, these organs are supplied by afferents from different parts of the vestibulocochlear nerve
. A recent histopathological study has documented that VS in one part of the nerve leads to loss of ganglions in the corresponding end organ, potentially leading to deteriorating function .
The common causes of non-vibratory tinnitus are presbycusis, conductive hearing loss due to wax or Eustachian tube dysfunction, trauma, tumours of vestibulocochlear nerve
and temporal lobe, Meniere's disease, otosclerosis, labyrinthitis, Bell's palsy, deficiency of vitamins, copper, iron, zinc, etc., metabolic disorders like hypothyroidism and diabetes mellitus, circulatory disorders like hypertension, drugs like NSAIDs, aspirin, aminoglycosides, antidepressants, etc.
The nerve exits the brain stem near the vestibulocochlear nerve
, passes through petrous temporal bone and then exits the skull through stylomastoid foramen and splits into auricular, palpebral, and buccal branches.