Acoustic Neuroma

(Tumor of cranial nerve VIII;. Vestibular schwannoma)

An acoustic neuroma, also called vestibular schwannoma, is a group derived from Schwann cells of the tumor VIII. Cranial nerve (vestibulocochlear nerve). Symptoms include, inter alia a one-sided hearing loss. The diagnosis is made audiological and secured by an MRI. If necessary, there is a therapy in a surgical removal and / or stereotactic radiation.

Acoustic neuroma almost always arise in the Vestibularisast VIII. Cranial nerve and are represented with a share of around 7% below the intracranial tumors. By expansive growth of the tumor from the inner ear canal may project up to the Cerebellopontine angle so VII. And VIII. Cranial nerve are compressed. If the tumor continues to grow, and cerebellum, brain stem and cranial nerves in the area (V and IX’s XII.) Can be compressed.

An acoustic neuroma, also called vestibular schwannoma, is a group derived from Schwann cells of the tumor VIII. Cranial nerve (vestibulocochlear nerve). Symptoms include, inter alia a one-sided hearing loss. The diagnosis is made audiological and secured by an MRI. If necessary, there is a therapy in a surgical removal and / or stereotactic radiation. Acoustic neuroma almost always arise in the Vestibularisast VIII. Cranial nerve and are represented with a share of around 7% below the intracranial tumors. By expansive growth of the tumor from the inner ear canal may project up to the Cerebellopontine angle so VII. And VIII. Cranial nerve are compressed. If the tumor continues to grow, and cerebellum, brain stem and cranial nerves in the area (V and IX’s XII.) Can be compressed. In neurofibromatosis (type 2) is often a bilateral acoustic neuroma developed. Symptoms and complaints symptom of acoustic neuroma is a slow-growing, single-sided sensorineural hearing loss. However, it can also occur suddenly and with varying degrees of severity of hearing loss. Early symptoms are also one-sided tinnitus, dizziness, loss of balance, headaches, pressure or fullness in the ear, ear pain, trigeminal neuralgia and numbness (anesthesia) or weakness of the facial nerve. Diagnostic audiogram gadolinium-enhanced MRI in asymmetric Hörverust An audiogram is the first test, which is performed during a physical examination to diagnose an acoustic neuroma. The hearing test usually results in an asymmetric sensorineural hearing loss and large reductions in Sprachdiskriminationsfähigkeit than would be expected based on the hearing loss. To clarify such findings imaging methods (preferably a gadolinium-enhanced MRI) are indicated. Other findings include a acoustic reflexes in the tympanometry. In auditory brainstem response potential, the absence of waveforms and / or increased latency of the fifth waveform can show. Although she does not have to be performed routinely in patients with asymmetric sensorineural hearing loss, a distinct sub-function of the vestibular nerve (channel palsy) can be detected on the affected side by a caloric test. Therapy Observation Occasionally surgical removal or stereotactic radiation in selected cases. Small, asymptomatic (ie discovered by chance..) And not growing Akustikneurinome not require treatment; Such tumors are observed by serial MRI scans and treated when they begin to grow or cause symptoms. Whether stereotactic radiation (eg. As a so-called. Gamma Knife or Cyberknife) or conventional microsurgery are used, depends on many factors, including the extent of the remaining hearing, on the tumor size and the age and health of the patient. Stereotactic radiation is applied tends to be in the elderly, those with smaller tumors or those who can not have surgery for medical reasons. Microsurgery can an approach to preservation of hearing include (access via the middle cranial fossa or retrosigmoidal) or a translabyrinthine approach, if no functional residual hearing is present any longer. Summary The acoustic neuroma usually occurs on one side, but can also be on both sides with neurofibromatosis. Unilateral hearing loss, sometimes with tinnitus and dizziness are typical. Larger and / or symptomatic tumors are treated with stereotactic radiosurgery or conventional microsurgery. Small or non-growing tumors can be observed with serial MRI scans.

Health Life Media Team

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