Fig. 2

Figure (2-1). A, B and C: Microphotographs of the histologic images of a grade II intracranial hemangiopericytoma patient (magnification × 200). A, Hematoxylin & Eosin staining demonstrated an extensively vascularized and cellular tumor; B, Immunohistochemical staining showed a strong positivity for CD34; C, immunohistochemical staining showed a 5% positivity for Ki67; D, E and F: Microphotographs of the histologic images of a grade III intracranial hemangiopericytoma patient (magnification × 200). D, Hematoxylin & Eosin staining demonstrated an extensively vascularized and cellular tumor; E, Immunohistochemical staining showed a strong positivity for CD34; F, Immunohistochemical staining showed a 10% positivity for Ki67. Compared with grade II HPC, the grade III tumor showed a higher percentage of ki67 positivity and more prominent nuclear fission and cell morphology heterogeneity. Figure (2-2). Magnetic resonance imaging (MRI) of a grade II intracranial hemangiopericytoma patient without recurrence after gross total resection. A-C: Preoperative T1-weighted MRI scans with contrast: A axial, B coronal and C sagittal images, showing an enhanced lesion at the right temporal lobe with central necrosis. D-F Postoperative T1-weighted MRI scans with contrast: D axial, E, coronal, and F, sagittal images, showing a complete tumor removal. The patient was recurrence-free 22 months after surgery. His histologic images were shown in Fig. 2–1