There was also a chronic leptomeningitis, with numerous streaks and flecks along the sulci, especially in the frontal region.    From Wordnik.com.  [The Journal of Abnormal Psychology] Reference

On removing the bones of the skull the brain appears to be normal macroscopically in a few instances, but in most cases the veins and capillaries of the meninges of the cerebrum, cerebellum, and occasionally the medulla is distinctly dilated and engorged, and in a few cases there are pronounced lesions of a leptomeningitis.    From Wordnik.com.  [Special Report on Diseases of the Horse] Reference

A further contribution to delusions of environmental nature was somewhat unexpectedly derived from a piece of work on the general mental symptomatology of general paresis. 4 Dichotomizing the paretics (all autopsied cases) into a group with substantial, i. e., encephalitic, atrophic or sclerotic lesions of the cortex and a group without such gross lesions or else with merely a leptomeningitis, I found the latter (or anatomically mild) group to be characterized by a set of symptoms which were all "contra-environmental," whereas the former (or anatomically severe) did not thus run counter to the environment.    From Wordnik.com.  [The Journal of Abnormal Psychology] Reference