Acoustic Neuroma: Causes, Tests, and Treatment Options
By Janet Hewitt
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About this ebook
One of the diseases that may take away our hearing is called Acoustic Neuroma. The sense of hearing is one of the most essential senses of the human body that allows us to experience and enjoy life to the fullest. But can we still enjoy life if we lose it? Acoustic Neuroma, also known as Vestibular Schwannoma, is a nonmalignant (non-cancerous) and slow-growing tumor of the vestibulocochlear nerve which transmits sound and balance information from the inner ear to the brain. This informative book guides you through the causes of acoustic neuroma, available tests and treatment options.
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Acoustic Neuroma - Janet Hewitt
Acoustic Neuroma: Causes, Tests and Treatment Options
Jane Hewitt, MA; Charles Berekeley, MD (Ed.)
Smashwords Edition
****
Copyright 2012 Jane Hewitt, Charles Berkeley
Cover image © Valua Vitaly - Fotolia.com
Smashwords Edition, License Notes
This ebook is licensed for your personal enjoyment only. This ebook may not be re-sold or given away to other people. If you would like to share this book with another person, please purchase an additional copy for each recipient. If you’re reading this book and did not purchase it, or it was not purchased for your use only, then please purchase your own copy. Thank you for respecting the hard work of this author.
Contents
Understanding Acoustic Neuroma
What Are The Symptoms Of Acoustic Neuroma?
What Causes Acoustic Neuroma?
How Is Acoustic Neuroma Diagnosed?
Treatments For Acoustic Neuroma Patients
Acoustic Patients, Their Story, And How It Affected Their Lives
What is Neurofibromatosis?
Glossary of Medical Terms
Appendix A: Internet Resources/Further Reading
Understanding Acoustic Neuroma
One of the diseases that may take away our hearing is called Acoustic Neuroma. The sense of hearing is one of the most essential senses of the human body that allows us to experience and enjoy life to the fullest. But can we still enjoy life if we lose it? Acoustic Neuroma, also known as Vestibular Schwannoma, is a nonmalignant (non-cancerous) and slow-growing tumor of the vestibulocochlear nerve which transmits sound and balance information from the inner ear to the brain.
The vestibulocochlear nerve aids in our hearing. When we hear, sound waves are gathered and funneled into the outer ear -- the pinna. The pinna channels the sound waves into the auditory canal. As the incoming sound waves hit the eardrum, it vibrates in exact frequency and amplitude. The vibration causes the ossicles (malleus, incus, and stapes) to vibrate in rocking motion in synchrony with the sound waves. As the stapes rock, it presses on the oval window causing it also to vibrate. The movement of the oval window creates waves in the fluid that fills the cochlea. As the waves travel through the cochlear fluid, they displace the basilar membrane to which hair cells are attached. This displacement causes the hair cells to bend from side to side. It is at this point that the mechanical energy of the wave is transduced into electrochemical impulses that are carried via auditory nerve to the brain. This auditory nerve is part of the vestibulocochlear nerve. Hence, if a tumor develops in the nerve, it will greatly affect your sense of hearing.
Acoustic neuromas comprise about 6% of all intracranial tumors, about 30% of brainstem tumors, and about 85% of tumors in the region of the cerebellopontine angle (CPA). Another 10% are meningiomas. Only about 10 tumors are newly diagnosed each year per million persons in the United States, corresponding to between 2,000 and 3,000 new cases each year. In patients with hearing asymmetry, it is believed that only about 1 in 1,000 has acoustic neuroma (source: National Institutes of Health).
TWO TYPES OF ACOUSTIC NEUROMA
Unilateral acoustic neuromas – this only affects the vestibulocochlear nerve at one side, accounting for about 8% of all tumors inside the skull. This tumor may develop at any