Figure 2

Histological findings. The left-frontal meningioma tissue shows hypercellular lesions (A), with focal necrosis (B) (original magnification, ×100), and a whorl formation (C) (original magnification, ×100). Frequent mitoses (D) (original magnification, ×200) are also evident. The immunohistochemical profile revealed approximately 20% Ki-67-positivity (E) (original magnification, ×100).