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Figure 2: (a and b) A cluster of rigid contoured and thickened leptomeningeal vessels embedded in a pool of subarachnoid hemorrhage (a) exhibit apple-green birefringence on Congo-red stain and polarized light (b).(c and d) Severe amyloid angiopathy with extensive vascular amyloid deposits, fi broid necrosis, luminal narrowing, and fragmentation of the vessel wall (a, c, and d: H and E stain; b: Congo-red stain; original magnifi cation a, b, and c: ×40; d: ×80).

Figure 2: (a and b) A cluster of rigid contoured and thickened leptomeningeal vessels embedded in a pool of subarachnoid hemorrhage (a) exhibit apple-green birefringence on Congo-red stain and polarized light (b).(c and d) Severe amyloid angiopathy with extensive vascular amyloid deposits, fi broid necrosis, luminal narrowing, and fragmentation of the vessel wall (a, c, and d: H and E stain; b: Congo-red stain; original magnifi cation a, b, and c: ×40; d: ×80).