Conclusions: Atypical meningiomas are rare tumors, grow more rapidely, the diagnosis age ≥ 60 years, several histological criteria can define accurate.

Grade II (atypical): Approximately 15 percent to-20 percent of meningiomas are atypical, which means that the tumor cells do not appear typical or normal. Atypical ...

Atypical meningioma is rare tumor and there is no accurate guide line for optimal treatment. This retrospective study analyzed the prognostic ...

Long-term survival is possible for patients with atypical meningiomas treated with surgery and postoperative RT. Multivariate analysis confirmed that age (<50 ...

Meningiomas account for approximately one-third of primary central nervous system tumors (and). Most meningiomas are benign (World Health ...

Atypical meningiomas are uncommon and have poorer prognosis when compared to benign meningiomas. Atypical meningiomas have a recurrence rate of 28%.

The image shows an atypical meningioma with small cell change, characterized by reduced cytoplasm and increased N/C ratio in these regions.

丙、 腦膜瘤(meningioma)：佔原發性腦瘤10-20%，主要分為腦膜瘤(meningioma, grade I)、非典型腦膜瘤(atypical meningioma, grade II)與分化不良(惡性)腦膜 ...

Atypical meningioma refers to a more aggressive form of meningioma and denotes a WHO grade II tumor (along with two histological variants, clear cell ...