atypical meningioma

atypical meningioma

A meningioma with a worse prognosis than typical meningiomas, which is characterised by cytologic atypia, increased cellularity, small cells with high nuclear:cytoplasmic ratios, prominent nucleoli, patternless or sheet-like growth, patchy necrosis, and ≥ 4 mitoses/10 HPFs.
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The surgical pathology revealed atypical meningioma with focal clear cell change (World Health Organization Grade II), which is separated with the brain by pia meter.
WHO grade 2 consists of four cases (8%) of meningioma, among them three cases were of atypical meningioma, and one case (2%) of clear cell meningioma.
Metachronous secondary atypical meningioma and anaplastic astrocytoma after postoperative craniospinal irradiation for medulloblastoma.
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).
The aim of this study is to review the outcome of newly diagnosed patients with atypical meningioma after therapy.
85 (Primitive Neuroectodermal Tumours) Tumours Meningioma 7 20 Meninges Atypical Meningioma 1 2.
There was one atypical meningioma with secondary malignant transformation by occasion of the second surgery.
Histopathology and MIB-1 labeling index predicted recurrence of meningiomas: a proposal of diagnostic criteria for patients with atypical meningioma.
In summary, in this paper, we present the cerebriform imaging characteristics of a rare intraparenchymal meningioma and review the imaging findings that could help us differentiate atypical meningiomas from other types of brain tumors such as CNS lymphoma and GBM.
En el articulo "Long-term recurrence rates of atypical meningiomas after gross total resection with or without postoperative adjuvant radiation", del 2009, un estudio retrospectivo de 108 casos de meningiomas atipicos en los cuales se practico reseccion quirurgica y posterior radioterapia, la recurrencia a 5 anos fue del 28 % [13].
Similar to atypical meningiomas, recurrence can be local or distant and may have a mortality rate of up to 23%.
Survival terms for atypical meningiomas are defined to range from 1 to 6 years (Stupak and Kalinowski, 2008).

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