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(A) An MRI image of an MCA aneurysm. (B) Intraoperative view. (C) Representative examples of fibrosis and fibroblastic activation in the aneurysm wall (H&E stain). (D) CTA image of a right MCA aneurysm. (E) Intraoperative view. (F) Focal areas of fibrosclerosis in the vascular wall (H&E stain).
