anaplastic meningioma

anaplastic meningioma

An aggressive form of meningioma, which is defined histologically as having > 20 mitoses/10 high-power fields and/or marked cytologic atypia.
References in periodicals archive ?
At 1.5 Tesla, mean ADC value for typical meningioma was 1.05+-0.11x10-3 and atypical/ anaplastic meningioma was 0.70 +- 0.04x10-3.
The diagnosis of anaplastic meningioma involving the spinal cord with extra neural metastasis of the present study was obtained through the clinical, histopathological and IHC findings.
KLF4 is a tumor suppressor in anaplastic meningioma stem-like cells and human meningiomas.
In our series, 2 men and 2 women (4 patients, 14.81%) were proved to have malignant transformation to anaplastic meningioma from atypical meningioma during the following operations to their recurrent disease.
Ramzan, "Intraparenchymal anaplastic meningioma in a child: a rare entity," Asian Journal ofNeurosurgery, vol.
Out of 10 malignant glial tumours 5 cases (50%) were reported as glioblastoma, 4 cases (40%) were reported as high grade astrocytoma and in one case suspicion of anaplastic meningioma was offered which was confirmed on paraffin section.
Classic, atypical, and anaplastic meningioma: three histopathological subtypes of clinical relevance.
Twenty-seven cases of WHO grade I meningiomas would have increased in grade to atypical meningiomas (WHO grade II), and one atypical meningioma would have increased to anaplastic meningioma (WHO grade III).
Ki-67 proliferative index predicts clinical outcomes in patients with atypical or anaplastic meningioma. Neuropathology, 27(2), 114-120.
There were not any features suggestive of atypical or anaplastic meningioma such as nuclear pleomorphism, increased mitosis, atypical mitosis or necrosis.
One case diagnosed as glioblastoma multiforme as it showed strong reactivity for GFAP, vimentin and negative for EMA, which ruled out possibility of anaplastic meningioma. Sarcoma is easily confused with glioblastoma on H&E staining, but GFAP reveals the glioblastoma.
The aggressive clinical course and short survival are consistent with both anaplastic meningioma and a high-grade sarcoma.