Fig. 2

Intraoperative images of removal tumors and photomicrographs of the surgical specimens. a. Yellowing white matter and RICM in the anterior temporal lobe (arrow). b. Lesion on the surface of CS (arrow), infratentorial herniation of the uncus of the temporal lobe (star). Oculomotor nerve is not visible. c. Inferiorly compressed distal segment of the cisternal oculomotor nerve (arrow), tumor encasement of the oculomotor nerve around its entrance into the CS. A thin layer of tumor tissue can be observed on the tentorial margin. d. Structures can be observed after tumor removal. e. Tumor cells of CSM are lobularly arranged and partially spiral-like, the tumor nucleus is elliptical, the nucleolus is not obvious, and the cytoplasm is unclear. f. Microscopically, there were old bleeding and malformed vessels in the nidus of the right temporal lobe, and dilated vessels were filled with red blood cells and lacked brain tissue. Cells were positive for CD31 and CD34 immunohistochemically