Sensorineural hearing loss is the result of extrinsic pressure from compression of the cochlear division of the eighth cranial nerve within the internal auditory canal by the tumor arising from the adjacent vestibular division. Patients usually present with unilateral hearing loss, often accompanied by tinnitus and vertigo. They almost always arise from Schwann cells of the vestibular portion of the vestibulocochlear nerve therefore, vestibular schwannoma is the preferred term. Key Words: acoustic neuroma, cerebellopontine angle, vestibulocochlear nerve, internal auditory canalĪcoustic neuromas, common benign tumors accounting for 10% of primary intracranial tumors, are the most common tumor in the cerebellopontine angle cistern. Although contrast-enhanced T1-weighted imaging remains the most commonly employed method for evaluation, high-resolution T2-weighted imaging provides a sensitive alternative for tumor detection. Magnetic resonance imaging is the most sensitive method of detection and also plays an important role in the follow-up of patients treated with both surgery and stereotactic radiosurgery. These tumors have specific imaging characteristics that can help differentiate them from other lesions that occur in the cerebellopontine angle cistern of the posterior fossa. Joseph’s Hospital and Medical Center, Phoenix, ArizonaĪcoustic neuromas are common benign lesions that can result in sensorineural hearing loss. Barrow-ASU Center for Preclinical Imagingĭivision of Neuroradiology, Barrow Neurological Institute, St.Department of Translational Neuroscience. ![]() Department of ENT and Skull Base Surgery.For Providers & Researchers Show submenu.Parkinson’s Disease & Movement Disorders.Center for Transitional Neuro-Rehabilitation.Please feel free to ask if you have further questions. Either way, it's important to talk to your physician about what these changes mean in relation to your symptoms and what can be done to reduce your risk for developing mental decline in the future. Depending on your symptoms and the severity of these changes, it may indicate Alzheimers Disease, vascular dementia or just a slight increase in age-related changes which have no noticable effect on your functioning. In other words, on average, these changes are linked with declines in mental function, but some people's brains just have more changes without affecting them while others have few changes but function more poorly. There's no indication in your report how severe these changes are and there's no concrete relationship between mental function and age-related changes. Basically, the MRI shows that you have changes normally associated with aging, but you have them to a greater degree than the average person your age should have. If they become numerous, they can lead to a gradual decline in mental function similar to Alzheimers Disease which is called "vascular dementia". Just like the shrinking, people accumulate these with age (especially if they have high blood pressure or vascular problems elsewhere, like the heart), but they are so small that they typically do not cause noticable symptoms. ![]() The white matter lesions are spots in the deep brain tissue that, in most cases, represent mini-strokes (tiny areas of the brain which die due to clogging of the small blood vessels which supply them). ![]() The fluid spaces within the brain (called ventricles) similarly become larger as the brain tissue surrounding them shrinks and retracts. This causes the spaces between the ridges on the surface of the brain (called sulci) to become larger as the ridges of brain tissue shrink. As people age, the brains shrink slightly.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |