Description neurinoma of the acoustic nerve
It is a benign, usually very slowly and gradually growing tumor packaging eighth cranial nerve. The eighth cranial nerve called vestibucochlear, and he also says statoakustický. Both names reflect that nerve signals from the body leads – that the brain transmits information about the balance of the body and its position in space and auditory stimuli, ie the sounds you hear and if we have two ears okay, and localization of sounds in space. Cranial nerves are a total of 12 pairs and are all based on the brain and the vagus nerve in addition to all its innervation ends in the head and neck.They control the muscles, glands and bring the brain sensitive information from the field, a stimulus of touch, pressure, heat and vibration.
Statoakustický nerve is special because it is the only transmits two different kinds of information from two completely different bodies.
The ear consists not only of the pinna and ear canal terminated drum. Continues středušní cavity in which they are placed tiny ossicles, the smallest bones in the body, the small muscles that are connected to the bones and the whole system is actually a system designed to convert sound energy received by the eardrum. Sound wave passes through the canal, hit the eardrum, the arches, behind him is ready to string three ossicular beginning gavel, the bottom of which is the drum adheres. Following anvil and stirrup after ending accrued to the oval window. Oval window is part of the inner ear. It is quite complex, stored in the temporal bone, and presents it to the bony labyrinth, in which is stored inside membranous labyrinth. Auditory portion is constituted by a coiled duct resembling a snail shell, so even her name – snail. In it are placed structures capturing and processing Bites waves. They represent a tiny hair cells underlying neural tiny hairs and they are intertwined together in one continuous auditory nerve to the brain. Cell carries the bony plate, inside kostěnného cochlea is a special fluid that transmits sound waves. Bones transmitted wave on a stirrup, which ends at the oval window – that’s part of the cochlea. The window arches again and wave energy goes to liquids and fluids on their own auditory cells, which convert energy from the waves of nervous excitement. This is the part that handles hearing nerve. It is a component of the acoustic.
Vestibular component is associated with a snail, it consists of three semicircular canals and two pouches. Ducts process information about the position of the head in space and in vesicles, cells are evaluating With Linear acceleration and deceleration. Again, the small cells in the tubules and vesicles group nerve fiber, to be attached to the auditory nerve and delivery to the brain results in the position information of the head and its variation, and the rotary head movements and accelerations. This is an equilibrium component of the eighth nerve.
Damage to the inner ear can cause a variety of adverse effects. For example, excessive noise, certain antibiotics, which are cells of the inner ear toxic by bad blood circulation or injuries landscapes sleep or just at the eighth nerve tumor. The nerve passes through his dear ‘naked’ fibers are not obanžena, but must be protected. Passes through a cavity of the inner ear, the bone ends and plunge into the brain tissue. Information, which transmits nerve must be isolated from all external influences that could somehow modify the information or direct damage. Protection provide him nervous packaging, or vagina, which feed the nerves and blood vessels, a nutritionist, and give him a strength and durability. Neuroma statoakustiku based on these packages.
The incidence of this cancer is 95% isolated, only 5% occurs as a hereditary, most often in conjunction with neurofibromatosis, benign tumors cutaneous nerves. It is usually one-sided, there are also forms of mutual schwannomas, but these in turn are genetically determined.Macroscopically, it is a well circumscribed and encapsulated tumor ovoid or spherical shape, which may be several centimeters wide. The average growth rate is about 1 mm per rok.Schwannom typically grows out of balance, vestibular nerve section, that are derived from and symptoms.
Symptoms of acoustic nerve neurinoma
Statoakustiku neuroma occurs most between 30th-50th year of life is not for him observed frequent occurrence at one of the sexes. Patients mostly to doctors introduce problems with balance, less frequently hearing, it already is a tumor so large that oppresses and auditory portion of the eighth nerve. Patients complain of resorting limbs during standing to one side, while walking also bottling the side. That is, if it is still only affected nerve. If the tumor grows to such an extent that it no longer oppresses the equilibrium of the brain, diagnosis is difficult because disturbances are not so significant, but rather the overall uncertainty in standing and walking. Symptom of an imbalance are also involuntary movements of the eyeballs, so. Nystagmus. It is also much better engageable when the affected nerve only and no longer part of the auditory pathway of the brain. Regarding hearing disorders, patients suffer from a so-called. Sensorineural hearing loss have difficulty hearing soft sounds especially, have trouble identifying sounds, and even loud. While tone audiogram examination may be normal. Hearing loss is also associated with whistling in the ears, called. Tinnitus. It has character with sensorineural hearing loss of high tones. Physician thus lead to the conclusion gradual slow deterioration of hearing, balance disorders and tinnitus, which, however, is associated with many other diseases ears.
Treatment neurinoma of the acoustic nerve
On suspicion of neuroma from imaging performed nuclear magnetic resonance. It displays the exact extent of the tumor and its size, which will help doctors determine treatment. If the tumor is small, it is recommended that only a monitor and if they grow faster, intervene. In growing tumors is elected radical microsurgery, performed by neurosurgeon majority. The access road is opening the occipital bone. It is necessary to remove the entire tumor, as other benign tumors in insufficient removal of relapses. From the collected tumor samples are sent for histological examination. It is an invasive procedure, so patients are burdensome shaving of hair, sometimes scar represents a certain burden and general anesthesia. In tumors the size of 1-1.5 cm is used so-called radiation. Leksell gamma knife. For patients, this form of treatment more comfortable for the reason that they do not open the skull and eliminates the risk of damage to surrounding nerves. During the examination the tumor focus and targeted radiation beam is irradiated and is being reduced to total extinction. It is a form of radiosurgery, when the beam of radio frequency energy obtained from sources 201 isotopes of cobalt. Everything is controlled by a fully automated computer evaluates all the images of resonance and calculate the appropriate parameters for irradiation. The patient’s head is placed in a special holder, so she could not move, and above his head is a hemisphere with outputs emitters.
How can I help myself
Sami can not help in any way, it is important to consult a doctor when dizziness, impaired hearing or ringing in the ears. These symptoms do not always mean finding a certain tumor is not worth panicking. Tumorigenesis not affect any prevention, vystříháním with external risk factors.
Complications neurinoma of the acoustic nerve
In addition to the above mentioned hearing loss, tinnitus and vertigo, which ruined lives and prevent certain activities, a major complication in large tumors oppression of brain tissue and corresponding symptoms oppression and relatives of other cranial nerves and the resulting problems. These include disturbances of sensation in the face, disorders of mimic muscles and taste disorders.
Increasing the volume of the brain and may cause intracranial hypertension, or high pressure within the brain cavity. That is accompanied by neurological symptoms such as disturbance of consciousness, headache, vomiting. For operations growing forms of risk is greater in damage VII.the nerve that controls the facial muscles.
Mortality is quite exceptional, in the early diagnosis of rare and does not apply to treatment.
Other names: statoakustiku neuroma, tumors mozkomozečkového angle Schwannom, tumor mostomozečkového corner, vestibular Schwannoma, neurilemmoma acoustics