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Melanosis, Leptomeninges (Pia-Arachnoid Mater), Sheep.
Note the black pigmentation of the leptomeninges overlying the olfactory poles and dorsal aspect of the frontal lobe. Meningeal melanosis is a normal finding in black-faced sheep and other animals with heavily pigmented skin.
(Courtesy Dr. D. Morton, College of Veterinary Medicine, University of Illinois.)
