Answer:
As in all meningitis, the inflammation of the meninges is diffuse. However, tuberculosis shows a preferential baseline location and sits mainly in the optochiasmatic region, under the peduncles, in the bulge and in the bulb.
Microscopic meningopial vessels are affected, with periarteritis and endarteritis, sometimes obstructive. The rest of the meninges show diffuse exudative congestive inflammation, with the possibility of observing a classified yellow granulation, very characteristic.
Explanation:
Tuberculous and related meningitis. It is a meningeal syndrome of onset and evolution generally subacute, and caused most of the time by Mycobacterium tuberculosis. However, although infrequently, certain fungi such as non-infectious Cryptococcus neoformans such as lymphomas and leukemia, are also responsible for the syndrome.
Mycobacterium tuberculosis always reaches the meninges hematogenously from a distant caseous focus. It can be the hilar adenopathy of the primary complex or any other focus. A few decades ago, this disease almost exclusively affected children and appeared as a result of early post-primary dissemination; At present, this eventuality is exceptional, so it is much more common to establish tuberculous meningitis in elderly patients with a very old focus, in which an immunosuppression related to age or of any other nature occurs.
