In addition, there were perivascular cuffs of plasma cells and lymphocytes in the brain, spinal cord, and choroid of the eye.
2.
The pia mater is reflected from the surface of the brain onto the surface of blood vessels in the subarachnoid space . " Perivascular cuffs " are regions of leukocyte aggregation in the spaces, usually found in patients with viral encephalitis.
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