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Constructive interference in steady state-3DFT MR imaging of the inner ear and cerebellopontine angle.
* Retro-sigmoid approach allows panoramic view of the cerebellopontine angle (CPA), but the cerebellar retraction is thought to cause postoperative ataxia.
They can also occur in the middle cranial fossa, olfactory groove, orbit, ventricles, cerebellopontine angle, and spine among others.
The most important causes of asymmetrical sensorineural hearing loss are neoplastic lesions in the internal acoustic meatus, such as vestibular schwannomas or other cerebellopontine angle tumors, as well as multiple sclerosis, stroke and other non-neoplastic causes.
Unfortunately, the tumour was at the cerebellopontine angle (CPA) where some nerves pass through when coming from the head.
Noncontrast MR examination at the level of the cerebellopontine angle reveals a vascular loop corresponding to the distal portion of the left vertebral artery, compressing the area at the origin of the left facial nerve at the pontomedullary junction (A and B).
There have been few case reports of ESMC of the oropharynx, masticator space, infratemporal fossa, cerebellopontine angle, orbit, chin, nasal septum, nasal cavity, buccal space, and sphenoid sinus.
Less frequently, meningiomas may be located in the optic nerve sheath, cerebellopontine angle, choroid plexus, and spinal cord [8, 9].
They cover, anterior cranial fossa, nasal cavity, and paranasal sinuses; the sellar, parasellar, and clival region; cerebellopontine angle and jugular fossa; petroclival and lateral skull base; open and endoscopic approaches to the sinonasal cavity and skull base; post-treatment appearance following skull base therapy; and neuroendovascular procedures for skull base neoplasia.
In addition to the mentioned pathology, there was a 10 x 4 mm enhancing lesion in the internal auditory meatus involving the 7th-8th nerve complex most likely acoustic neuroma, and there was no extension to the cerebellopontine angle (Figure 2(b)).
Furthermore, vestibular schwannomas maybe differentiated from a cerebellopontine angle meningioma by the predilection of schwannomas to demonstrate microhemorrhages on T2-weighted imaging [15].
MRI brain and internal auditory canal showed a 2.1 x 1.1 x 1 x 1 cm right acoustic schwannoma in the internal auditory canal with extension into the cerebellopontine angle cistern with involvement of the right cochlea and the vestibule with no evidence of pituitary tumor or brain compression.
Some authors found in CH patients abnormalities of cerebral glucose brain metabolism, hypometabolism in the cerebellopontine area, perigenual anterior cingulate cortex, and prefrontal and orbitofrontal cortex during bout and out of bout [4-6].
Of these, 27.9% were gliomas (including glioblastomas, astrocytomas, oligodendrogliomas), 26.4% were meningiomas, 3.4% were pituitary macroadenomas, 0.5 craniopharyngiomas, 13.5% schwannomas more commonly in cerebellopontine angle, 3.8% were ependymomas, 9% were cysts (epidermoid, arachnoid and colloid cyst), 3.4% were cerebellar haemangioblastomas, 1.9% were cavernomas, 4.8% were space-occupying lesions unclassified (biopsy not done), and 5.3% were secondary metastatic from elsewhere in the body.