“…18) Pathologically, a malignant, angiomatous, and fibrous meningioma has a tendency to bleed. 3,12) In the present case, there were no findings to suggest the definitive source of SAH, but clot was identified on the tumor surface on MR images obtained 12 days after the onset, and fibrin deposit on the specimens obtained from tumor resection 19 days after resection. Review of the clinicopathological features of 145 meningiomas with spontaneous intracranial bleeding found that all 6 tumors arising in the posterior fossa caused SAH, and none of them presented with intratumoral hemorrhage.…”