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Figure 1. Acute Bacterial Meningitis.
A basal view of the brain of a 76-year-old man who died of acute Streptococcus pneumoniae meningitis is shown. A thick, purulent exudate (black arrow) obscures the ventral aspect of the brain stem, encasing the basilar artery and cranial nerves. The exudate tracks over the ventral cerebellar hemispheres and fills the basal cisterns, including the cisterna magna. A large depressed and pigmented scar is visible on the left (white arrows), in the right frontal and temporal lobes, presumably the result of an old contusion and focal tissue loss.
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