Amyloid β-related angiitis of the central nervous system occurring after COVID-19 vaccination: A case report

Figure 2 Histopathology of the patient’s brain. A: Brain biopsy of the left occipital lobe (hematoxylin and eosin staining, × 100) showing granulomatosis vasculitis in the medium-sized blood vessels; B: Brain biopsy of the left occipital lobe (immunohistochemical staining against amyloid β, × 100) showing deposits of amyloid β on the walls of medium-sized blood vessels under the arachnoid; C: Brain biopsy of left occipital lobe (immunohistochemical staining against amyloid β, × 200) showing multinucleated macrophages phagocytosing amyloid.