meningioma


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meningioma

[mə‚nin·jē′ō·mə]
(medicine)
A localized tumor composed of meningeal cells, involving the meninges and other central nervous system structures. Also known as meningothelioma.
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Orbital meningioma with a granular cell component in a dog, with extracranial metastasis.
Several studies are available that characterize meningioma by DWI, however the provided data was inconsistent.6,10,13-15 Some did not identify any significant difference between the mean ADC ratios of benign and atypical/malignant tumors13 while some studies found that the mean ADC value of benign tumors was significant higher than the ADC value of atypical/malignant meningiomas.6,10,14,15 So this study was done to assess the overall performance of the DWI in terms of sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) and accuracy in our population.
Meningioma is a benign extra-axial brain mass originated from arachnoid cap cells.
Among the meningeal tumours, Transitional meningioma (20 cases, 25%) was the predominant one.
Multiple case control studies have reported the association between meningioma growth and hormones.
One case of meningioma (papillary subtype) was diagnosed as metastatic deposit due to papillae formation and highly atypical features [Figure 3a-d].
A 65-year-old female was initially diagnosed with cerebellar meningioma in admission on December 8, 2016, at the same time, she was diagnosed left renal cancer first taken radical resection of renal carcinoma and pathology showed clear-cell carcinoma, Class II.
Extracranial meningioma does not have melanin pigment as well as areas of Antoni A and Antoni B expected to be seen in psammomatous melanocytic schwannoma.
Immunohistochemical determination of five somatostatin receptors in meningioma reveals frequent overexpression of somatostatin receptor subtype sst2A.
4D-CTA sequential dynamic images without and with bone subtraction (Figure 2) showed hypertrophied superficial temporal and occipital arteries feeding the meningioma on the arterial phase.
We present a case of chronic OME revealing underlying meningioma and based on a literature review, discuss the main aspects of diagnosis and management of this condition.
They can be divided into intra and extra-axial tumors depending on the location with respect to neuronal tissue.1 In the United States it accounts for 9.5/100,000 cases.2 Common clinical presentations of brain tumors are headache, vomiting, seizures, behavioral changes, vertigo, neurological deficits etc.3 Gliomas are the most common brain tumors followed by meningiomas. The outcome of patient with brain tumors depends on the pre-operative neurological deficit and imaging features on Magnetic Resonance Imaging (MRI).