Definition of "leptomeninges" []

• The innermost layers of the meninges; the pia mater and the arachnoid (noun)

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• "Cerebral amyloid angiopathy (CAA) refers to the deposition of b - amyloid in the media and adventitia of small - and mid-sized arteries (and less frequently, veins) of the cerebral cortex and the leptomeninges."