Figure 14-43.

Suppurative Bacterial Meningitis, Cerebral Hemispheres, Horse.

A, Pale yellow-white thick exudate consistent with an infiltrate of neutrophils admixed with bacteria, cellular debris, edema fluid, and fibrin is present in the subarachnoid space on the lateral surface and also in the sulci. Overall the gyri are flattened, indicating brain swelling and compression. B, The arachnoid space of the leptomeninges in this sulcus contains a mixture of neutrophils (arrows), other mononuclear inflammatory cells, cellular debris, edema fluid, and fibrin. H&E stain.

(A courtesy Dr. M.D. McGavin, College of Veterinary Medicine, University of Tennessee. B courtesy Dr. J.F. Zachary, College of Veterinary Medicine, University of Illinois.)