Fig. 2

Pathological findings of the primary intracranial meningioma. a Short spindle-shaped tumor cells with acidophilic cytoplasm were densely proliferated, and the area of necrotic tumor cells were also confirmed (hematoxylin–eosin staining, original magnification 200×). b Tumor cells were observed to infiltrate the bone tissue (hematoxylin–eosin staining, original magnification 200×). c Ki-67 staining with MIB-1 antibody stained 10% of tumor cells (immunostaining with anti-MIB-1 protein polyclonal antibody, original magnification 100×)