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.

Meningioma in the internal auditory canal

2001 ◽  
Vol 115 (1) ◽  
pp. 48-49 ◽  
Author(s):  
P. Martinez Devesa ◽  
M. J. Wareing ◽  
D. A. Moffat
Keyword(s):  
Magnetic Resonance Imaging ◽  
Differential Diagnosis ◽  
Magnetic Resonance ◽  
Histological Examination ◽  
Vestibular Schwannoma ◽  
Internal Auditory Canal ◽  
Resonance Imaging ◽  
Translabyrinthine Approach ◽  
Magnetic Resonance Imaging Mri

A case is presented of an entirely intracanalicular meningioma in a 48-year-old woman that was excised via a conventional translabyrinthine approach to the internal auditory canal (IAC). Pre-operative magnetic resonance imaging (MRI) suggested that the tumour was a vestibular schwannoma (VS). Histological examination confirmed the intra-operative impression that the tumour was a meningioma. Although VS is by far the commonest intracanalicular tumour, the differential diagnosis includes meningioma. MRI is unable to distinguish between these two entities when the tumour is located entirely in the internal auditory canal.

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.

Magnetic resonance imaging screening for vestibular schwannoma: analysis of published protocols

2004 ◽  
Vol 118 (5) ◽  
pp. 329-332 ◽  
Author(s):  
R. J. Obholzer ◽  
P. A. Rea ◽  
J. P. Harcourt
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Vestibular Schwannoma ◽  
Resonance Imaging ◽  
Patient Anxiety ◽  
Interaural Difference ◽  
Magnetic Resonance Imaging Mri ◽  
Magnetic Resonance Imaging Screening ◽  
The One ◽  
Year 2000

This study seeks to define the most appropriate guidelines for selection of patients for magnetic resonance imaging (MRI) to exclude a vestibular schwannoma. Improved selection may reduce patient anxiety and improve resource utilization.All MRIs of the internal auditory meatus, performed during the year 2000, were reviewed. Audiograms and symptoms were collated for all ’positive’ scans and 100 negative scans. Information was analysed using seven published protocols and other defined frequency specific criteria.A diagnosis of vestibular schwannoma was made on 36 scans. Four criteria had a sensitivity of >95 per cent; of these the highest specificity (49 per cent) utilized an interaural difference at two adjacent frequencies of 15.dB in unilateral hearing loss and 20.dB in bilateral asymmetric loss.Applying our best protocol would have reduced the number of scans performed from 392 to 168. The one patient with a vestibular schwannoma who was excluded had trigeminal paraesthesia, an independent indication for investigation.

Discrepancy between Computed Tomography and Magnetic Resonance Imaging in a Case of Medulloblastoma

Neurosurgery ◽  
1985 ◽  
Vol 17 (3) ◽  
pp. 487-489 ◽  
Author(s):  
Michael D. Heafner ◽  
Luis Schut ◽  
Roger J. Packer ◽  
Derek A. Bruce ◽  
Larissa T. Bilaniuk ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Brain Stem ◽  
Posterior Fossa ◽  
Imaging Techniques ◽  
Signs And Symptoms ◽  
Brain Stem Glioma ◽  
Resonance Imaging ◽  
Computed Tomographic ◽  
Magnetic Resonance Imaging Mri

Abstract In a 2-year-old girl with signs and symptoms of a posterior fossa tumor, the computed tomographic scan showed what appeared to be a brain stem glioma. However, magnetic resonance imaging (MRI) demonstrated the lesion to be extrinsic to the brain stem. Posterior fossa exploration disclosed a medulloblastoma filling the 4th ventricle. This discrepancy in imaging techniques points out the usefulness of MRI in the evaluation and treatment of posterior fossa lesions.

Outcome of using magnetic resonance imaging as an initial screen to exclude vestibular schwannoma in patients presenting with unilateral tinnitus

1999 ◽  
Vol 113 (9) ◽  
pp. 818-822 ◽  
Author(s):  
P. J. D. Dawes ◽  
H. E. Basiouny
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Vestibular Schwannoma ◽  
Clinical Presentation ◽  
Resonance Imaging ◽  
Auditory Brain Stem Response ◽  
Strong Argument ◽  
Screening Guidelines ◽  
Auditory Brain Stem ◽  
Brain Stem Response

AbstractThe improved cost-effectiveness of gadolinium-enhanced magnetic resonance imaging (MRIg) as a diagnostic tool for vestibular schwannoma has resulted in smaller tumours being diagnosed. There has been a change in the clinical presentation of these tumours and up to four per cent may present with unilateral tinnitus. The limitation of auditory brain stem response (ABR) as a screening tool that detects small tumours is recognized and there is a strong argument for using MRIg as the initial investigation.Various screening guidelines have been proposed, some include submitting patients with unilateral tinnitus for MRIg. This report describes the findings in a group of 174 patients presenting with unilateral tinnitus who underwent MRIg as part of a guideline-directed screen to exclude vestibular schwannoma. Five patients had a cause for their tinnitus diagnosed, one a vestibular schwannoma. Two had intracranial aneurysms and another three had pathology revealed that merited onward referral. A further nine patients had incidental findings that neither accounted for their symptoms nor needed further investigation or referral.The rationale for screening these patients with MRIg is discussed.

Magnetic resonance imaging: is a single scan ever enough for the diagnosis of acoustic neuroma?

2006 ◽  
Vol 120 (12) ◽  
pp. 1061-1063 ◽  
Author(s):  
M D Kernohan ◽  
K J Blackmore ◽  
I J M Johnson ◽  
I Zammit-Maempel
Keyword(s):  
Magnetic Resonance Imaging ◽  
Hearing Loss ◽  
Magnetic Resonance ◽  
Acoustic Neuroma ◽  
Pure Tone ◽  
Resonance Imaging ◽  
Potential Significance ◽  
Mri Scan ◽  
Magnetic Resonance Imaging Mri ◽  
Negative Scan

A patient presented with unilateral, right-sided hearing loss and tinnitus and underwent gadolinium-enhanced magnetic resonance imaging (MRI). A pure tone audiogram showed a right-sided sensorineural hearing loss. The MRI scan was initially negative but when repeated seven years later, following a further deterioration of symptoms, it showed a 2 mm, right-sided acoustic neuroma.This case has great potential significance for the diagnosis of acoustic neuroma, and it may raise medico-legal issues regarding the exclusion of this diagnosis. The case illustrates that a single negative scan may not be adequate if pure tone audiograms show deterioration in hearing loss.

Diagnosis of a posterior fossa tumour by magnetic resonance imaging

1987 ◽  
Vol 146 (2) ◽  
pp. 97-99 ◽  
Author(s):  
Michael T.W. Houang ◽  
Geoffrey L. Coffey ◽  
Lynette T. Masters ◽  
Michael S. Stern ◽  
Malcolm F. Pell
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Posterior Fossa ◽  
Resonance Imaging ◽  
Posterior Fossa Tumour

scholarly journals Post-operative meningeal thickening seen on magnetic resonance imaging

2021 ◽  
Vol 32 (2) ◽  
pp. 207-211
Author(s):  
Rafaela Queiroz de Morais ◽  
Rodrigo M. da Silva ◽  
Diogo G. Corrêa
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Posterior Fossa ◽  
Low Grade ◽  
Leptomeningeal Dissemination ◽  
Resonance Imaging ◽  
Posterior Fossa Tumors ◽  
Neurosurgical Patients ◽  
Meningeal Dissemination ◽  
Magnetic Resonance Imaging Mri

Posterior fossa tumors are relatively common in children, and the meningeal dissemination of these tumors is well established in the literature. Although leptomeningeal dissemination is more common in high-grade tumors, even low-grade tumors can generate meningeal metastases. In this case report, we would like to discuss the importance of leptomeningeal dissemination assessment of posterior fossa tumors in children, in the preoperative period, through the entire neuroaxis magnetic resonance imaging (MRI). This is important since transient meningeal thickening is very common in the postoperative periods of neurosurgical patients, and can be found for up to 5 or 6 years after surgery, causing these patients to undergo prolonged follow-ups and repeated MRIs and lumbar punctures.

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