Nerve origin of the acoustic neuroma

2001 ◽  
Vol 115 (5) ◽  
pp. 376-379 ◽  
Author(s):  
Atsushi Komatsuzaki ◽  
Atsunobu Tsunoda
Keyword(s):  
Acoustic Neuroma ◽  
Japanese Patients ◽  
Vestibular Nerve ◽  
Surgical Removal ◽  
Resonance Imaging ◽  
Acoustic Neuromas ◽  
Anatomical Basis ◽  
Inferior Vestibular Nerve ◽  
Magnetic Resonance Imaging Mri ◽  
The Individual

Two hundred and seventy-one Japanese patients who underwent surgical removal of neuroma from the cerebello-pontine angle using the translabyrinthine approach were retrospectively reviewed in order to investigate the nerve origin on an anatomical basis. In 269 out of the 271 cases, the origin of the neuromas was identified. Among these cases, 84.8 per cent of tumours originated from the inferior vestibular nerve (IVN), followed by the superior vestibular nerve (SVN) (8.9 per cent). Of the 5.6 per cent of tumours arising from the vestibular nerve, however, it could not be determined whether they originated from the SVN or IVN. Two cases of neuromas originating from the facial nerve were seen (0.7 per cent). No neuroma arose from the cochlear nerve.Currently, the diagnosis of acoustic neuromas is best made with Gd-enhanced magnetic resonance imaging (MRI). However, our data indicate that the development of a functional test of the individual IVN can be useful for screening most cases of acoustic neuroma and in facilitating their early diagnosis.

The Diagnostic Value of MRI in Traumatic Brachial Plexus Injury

1994 ◽  
Vol 19 (1) ◽  
pp. 55-59 ◽  
Author(s):  
M. OCHI ◽  
Y. IKUTA ◽  
M. WATANABE ◽  
K. KIMOR ◽  
K. ITOH
Keyword(s):  
Brachial Plexus ◽  
Nerve Root ◽  
Brachial Plexus Injury ◽  
Diagnostic Value ◽  
Resonance Imaging ◽  
Nerve Roots ◽  
Surgical Exploration ◽  
Nerve Root Avulsion ◽  
Magnetic Resonance Imaging Mri ◽  
The Individual

Findings in 34 patients with traumatic brachial plexus injury documented by surgical exploration and intra-operative somatosensory-evoked potentials were correlated with findings on myelography and magnetic resonance imaging (MRI) to determine whether MRI can identify nerve root avulsion. The coronal and sagittal planes were not able to demonstrate avulsion of the individual nerve roots. The axial and axial oblique planes did provide useful information to determine which nerve root was avulsed in the upper plexus, although it was difficult to clearly delineate the lower cervical rootlets. The accuracy of MRI was 73% for C5 and 64% for C6 and that of myelograpby 63% for C5 and 64% for C6. Thus, the diagnostic accuracy of MRI for upper nerve roots was slightly superior to myelography. Although its primary diagnostic value is limited to the upper nerve roots whose avulsion is relatively difficult to diagnose by myelography, MRI can provide useful guidance in the waiting period prior to surgical exploration after brachial plexus injury.

scholarly journals Use of Magnetic Resonance Imaging to Predict Outcome after Stroke: A Review of Experimental and Clinical Evidence

2010 ◽  
Vol 30 (4) ◽  
pp. 703-717 ◽  
Author(s):  
Tracy D Farr ◽  
Susanne Wegener
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Complete Recovery ◽  
Research Translation ◽  
Resonance Imaging ◽  
Preclinical Research ◽  
Stroke Research ◽  
Future Potential ◽  
Magnetic Resonance Imaging Mri ◽  
The Individual

Despite promising results in preclinical stroke research, translation of experimental data into clinical therapy has been difficult. One reason is the heterogeneity of the disease with outcomes ranging from complete recovery to continued decline. A successful treatment in one situation may be ineffective, or even harmful, in another. To overcome this, treatment must be tailored according to the individual based on identification of the risk of damage and estimation of potential recovery. Neuroimaging, particularly magnetic resonance imaging (MRI), could be the tool for a rapid comprehensive assessment in acute stroke with the potential to guide treatment decisions for a better clinical outcome. This review describes current MRI techniques used to characterize stroke in a preclinical research setting, as well as in the clinic. Furthermore, we will discuss current developments and the future potential of neuroimaging for stroke outcome prediction.

Audit of regional screening guidelines for vestibular schwannoma

1998 ◽  
Vol 112 (9) ◽  
pp. 860-864 ◽  
Author(s):  
P. J. D. Dawes ◽  
J.-P. Jeannon
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Posterior Fossa ◽  
Vestibular Schwannoma ◽  
Acoustic Neuroma ◽  
Resonance Imaging ◽  
Posterior Fossa Tumour ◽  
Screening Guidelines ◽  
Magnetic Resonance Imaging Mri

AbstractAn audit of 334 patients who underwent magnetic resonance imaging (MRI) as investigation for a possible diagnosis of vestibular schwannoma was carried out to assess adherence to previously agreed screening guidelines. This represents one year's activity. A posterior fossa tumour was identified in 12 patients. Scan requests were judged to be inappropriate for 28 cases. The issues surrounding the screening for acoustic neuroma are discussed.

The potential of support vector machine as the diagnostic tool for schizophrenia: A systematic literature review of neuroimaging studies

2011 ◽  
Vol 26 (S2) ◽  
pp. 1363-1363 ◽  
Author(s):  
M.P. Collins ◽  
S.E. Pape
Keyword(s):  
Support Vector Machine ◽  
Diagnostic Tool ◽  
Literature Search ◽  
Structural Mri ◽  
Support Vector ◽  
Systematic Literature Search ◽  
Resonance Imaging ◽  
Pubmed Database ◽  
Magnetic Resonance Imaging Mri ◽  
The Individual

IntroductionSchizophrenia is a relatively common chronic psychotic mental illness, which usually continues throughout life. Current diagnosis is based on a set of psychiatrist-applied diagnostic criteria. There can be considerable differences between diagnostic classification based upon either the set of criteria used, or the individual who applies the criteria. For this reason, the development of an objective test to inform the diagnosis could be highly beneficial.ObjectivesTo assess the use of Support Vector Machine (SVM) as a potential diagnostic tool for schizophrenia, with a particular focus on the application of SVM to Magnetic Resonance Imaging (MRI) data.AimsTo show the use of SVM on MRI data to be a potentially viable diagnostic test.MethodA systematic literature search was carried out using the PubMed database, Web of Knowledge as well as Google Scholar. This search was conducted using the terms ‘Schizophrenia’, ‘SVM’/‘Support Vector Machine’ and ‘MRI/fMRI’. This was followed by the application of criteria relating to relevance to the desired search topic (as assesed by the author). Ten publications were identified as relevant.ResultsResults showed strong evidence that the application of SVM to MRI data can reliably differentiate between patients with schizophrenia and healthy controls.ConclusionsThe results indicate that using SVM to analyse MRI data can be reliably used to identify schizophrenia, although there is some variability between the results produced. The potential of SVM in application to fMRI (as opposed to structural MRI) data is yet to be fully explored.

scholarly journals Diagnosis and Management of Wooden Foreign Bodies in the Orbit: A Case Report

2021 ◽  
Vol 17 (2) ◽  
pp. 158-161
Author(s):  
Hyo Bong Kim ◽  
Hoon Kim ◽  
Soo Yeon Lim ◽  
In Chang Koh
Keyword(s):  
Magnetic Resonance Imaging ◽  
Optic Nerve ◽  
Foreign Bodies ◽  
Surgical Removal ◽  
Resonance Imaging ◽  
Upper Eyelid ◽  
Diagnosis And Management ◽  
Optic Nerve Damage ◽  
Magnetic Resonance Imaging Mri

The diagnosis and management of intraorbital foreign bodies are challenging for surgeons. Foreign bodies made of wood and those located close to the optic nerve are especially difficult to manage. Herein, we report our experience with the diagnosis and management of intraorbital wooden foreign bodies utilizing magnetic resonance imaging (MRI). A 50-year-old man presented to the emergency room with a laceration on his left upper eyelid. No foreign bodies were visible through the laceration, and computed tomography findings showed only evidence of cellulitis with abscess formation. Despite drainage and antibiotics, the cellulitis worsened; subsequently, we found multiple wooden foreign bodies on MRI. Surgical removal was performed, excluding those in the intraconal space to avoid optic nerve damage. The patient recovered well and has not experienced any ophthalmic complications at 1 year of follow-up.

Multicystic Acoustic Neuroma

1989 ◽  
Vol 30 (1) ◽  
pp. 7-9 ◽  
Author(s):  
A. J. Drapkin ◽  
W. S. Rose
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Acoustic Neuroma ◽  
Cerebellopontine Angle ◽  
Rare Case ◽  
Resonance Imaging ◽  
The Common ◽  
Magnetic Resonance Imaging Mri ◽  
Common Signal ◽  
Signal Intensities

A rare case of a multicystic acoustic neuroma is reported. At computed tomography (CT) and magnetic resonance imaging (MRI) the tumor was found to cause hydrocephalus, and displacement of the brainstem. The multicystic character was revealed on CT, while MRI only showed the mass lesion and the common signal intensities for an acoustic neuroma. The differential diagnosis of a multicystic lesion in the cerebellopontine angle is discussed.

Preoperative Differentiation between Meningioma of the Cerebellopontine Angle and Acoustic Neuroma Using MRI

1993 ◽  
Vol 109 (1) ◽  
pp. 88-95 ◽  
Author(s):  
Anil K. Lalwani ◽  
Robert K. Jackler
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
San Francisco ◽  
Acoustic Neuroma ◽  
Cerebellopontine Angle ◽  
Internal Auditory Canal ◽  
Resonance Imaging ◽  
Mri Findings ◽  
Dural Tail ◽  
Magnetic Resonance Imaging Mri

Preoperative differentiation between acoustic neuroma (AN) and meningioma of the cerebellopontine angle (CPA) is important in selection of the surgical approach, successful tumor removal, and preservation of hearing and facial nerve. We retrospectively reviewed the magnetic resonance imaging (MRI) findings associated with 30 meningiomas involving the CPA (MCPA) encountered between 1987 to 1991 at the University of California, San Francisco. Magnetic resonance imaging was critical in differentiating meningioma from AN in the CPA. Typical findings on MRI associated with MCPA, differentiating them from ANs, Include: Meningiomas are sessile, possessing a broad base against the petrous face, whereas ANs are globular; they are often extrinsic and eccentric to the internal auditory canal (IAC); when involving the IAC, they usually do not erode the IAC; MCPAs demonstrate hyperostosis of the subjacent bone and possess intratumoral calcification; they involve adjacent intracranial spaces and structures; and meningiomas are characterized by a distinctive dural “tail” extending away from the tumor surface. While any one finding may not be diagnostic by itself, taken together the constellation of these findings is strongly Indicative of meningioma. In our experience, MRI with gadolinium enhancement was able to distinguish MCPA from AN in nearly every case.

Chemotherapy of Bilateral Acoustic Neuromas

1988 ◽  
Vol 98 (4) ◽  
pp. 273-282 ◽  
Author(s):  
Robert A. Jahrsdoerfer ◽  
Robert S. Benjamin
Keyword(s):  
Acoustic Neuroma ◽  
Great Risk ◽  
Surgical Removal ◽  
Residual Hearing ◽  
Unequal Size ◽  
Acoustic Neuromas

In patients with bilateral acoustic neuromas, it is not unusual for the tumors to be of unequal size. At the time of the first examination, the smaller tumor may have already destroyed the hearing, while the ear with residual hearing may harbor a large acoustic neuroma. The remaining hearing is then at great risk if surgical removal of the tumor is attempted. Chemotherapy of bilateral acoustic neuromas is here presented as a possible alternative to surgery in those patients whose prognosis for conservation of hearing is poor.

Magnetic Resonance Imaging of Acoustic Neuromas

Neurosurgery ◽  
1985 ◽  
Vol 16 (6) ◽  
pp. 763-765 ◽  
Author(s):  
Gary J. DeFilipp ◽  
William A. Buchheit
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Spin Echo ◽  
Pulse Sequences ◽  
Resonance Imaging ◽  
Diagnostic Modality ◽  
Computed Tomographic ◽  
Acoustic Neuromas ◽  
Magnetic Resonance Imaging Mri ◽  
Echo Pulse

Abstract Ten patients with neurosensory hearing loss and computed tomographic (CT) evidence of acoustic neuromas were evaluated with magnetic resonance imaging (MRI). Tumors ranged in size from 0.8 to 3.7 cm. With the use of spin echo pulse sequences, all tumors were identified by MRI and appeared as masses with signal intensities greater than that of cerebrospinal fluid and equal to or greater than that of brain stem. Two patients who previously had undergone operation for acoustic neuromas were evaluated with MRI. In one patient with CT evidence of tumor recurrence, the lesion could not be identified by MRI. MRI holds promise of becoming a primary diagnostic modality for the evaluation of acoustic neuromas.

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