Preliminary diagnostic procedures include ear examination, hearing and<unk>  testing. The auditory brainstem response test (ABR) is a cost-effective test to see if a<unk>  has perhaps compromised the cochlear nerve. Computed tomography (CT scan) of the head will detect moderate to large sized<unk>  but can miss small sized<unk> .<unk>  appears as isodense to surrounding brain parenchyma on CT.<unk>  does not have calcifications in it. Large<unk>  will expand the size of internal acoustic meatus (IAC), thus associated with poor hearing function because the nerves within the IAC are compressed, particularly the cochlear nerve. However, facial nerve is less commonly affected. The main advantage of CT scan is to assess the extent of bony involvement by<unk> .<unk>  enhances when iodinated contrast is given. Contrasted CT scan of temporal bone can done if the subject is unsuitable to undergo MRI scan. MRI scan is the imaging of choice because it can more accurately differentiate the mass from other tumours such as meningioma, facial nerve<unk> , epidermoid cyst, arachnoid cyst, aneurysm, and brain metastasis. MRI scan also helps in surgical planning and follow-up of the tumour after surgery. VC is usually isointense on T1 weighted images, hyperintense on T2 weighted images, and enhances after given gadolinium contrast.
Vestibular schwannoma
Optic nerve sheath meningioma
Intraocular schwannoma
Choroid plexus papilloma
Craniopharyngioma
Optic nerve glioma
Mantleoma
Pinealoma