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FIG 2. Cerebral amyloid angiopathy in area showing hypointense MR lesion. Yellow-green birefringency of amyloid deposits in the vessel walls under polarized light corresponds to bright spots and perivascular leakage of erythrocytes (arrow). Temporal cortex, polarization optics; alkaline Congo stain, original magnification x32.
FIG 3. A, MR-positive old microbleed with a diameter of 2 to 3 mm in the subcortical white matter. Numerous darkly stained hemosiderophages are seen in the center, close to a ruptured vessel (arrows). There is extensive perivascular edema. Masson trichrome stain, original magnification x201.
B, Hypertensive angiopathy with dilatation of perivascular spaces and deposition of a few hemosiderin-laden macrophages (arrow) not seen on MR study. Reactive astrocytes are present in the surrounding neuropil. Masson trichrome stain, original magnification x162.
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