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An atypical grade II meningioma was found in 5 (11.9%) (Fig. 4g), and only 1 (2.4%) had an anaplastic type grade III meningioma.
Despite atypical features, it did not meet the WHO (1997) criteria for atypical (grade II) meningioma.
Sporadic multiple meningiomas showed a frequency of genomic imbalance events comparable to the atypical grade solitary tumors.
According to the World Health Organization (WHO) meningiomas can be divided into three histological grades: benign (grade 1), atypical (grade 2), and anaplastic meningiomas (grade 3).
They are classified into three World Health Organization (WHO) grades: benign (Grade I), atypical (Grade II), and malignant (Grade III) [ 1] based on the degree of anaplasia, number of mitoses, and presence of necrosis [ 1, 3].
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These tumors have a wide spectrum of atypical grades ranging from low-grade dysplasia to invasive carcinoma [19].
Interestingly hTERT, MCM5, and PPP1CA were positive in all 7 samples with atypical cells grade 2 or grade 3 that were diagnosed as non-recurrent because no tumors were found at cystoscopy; however, all were diagnosed with a tumor in the follow-up period.
Group 2 included atypical, WHO grade II (n = 28) and anaplastic, WHO grade III (n = 9) tumors, and group 3 was composed of WHO grade I meningiomas of meningotheliomatous (n = 8) and fibrous (n = 3) morphology [ 21].
Other definitions were used to indicate borderline lesions, such as "atypical enchondroma," "grade 0 chondrosarcoma," and "cartilaginous lesion with unknown malignant potential" (CLUMP) [6, 7], but finally there was no common agreement on the adequacy and usefulness of these definitions, which have now generally been abandoned.
* Positive cytology defined by atypical cells grade 2 or 3 in the urine.
However, stereotactic radiosurgery produced only a 49% progression free survival in atypical, WHO grade II meningiomas and is ineffective in treatment of anaplastic meningiomas [ 15].
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