SPINAL CORD. 129 
There may be multiple abscesses formed from pysemic infection, or 
there may be large, single abscesses, some encapsulated and others not. 
The contents of these abscesses may be composed of thin or cheesy pus. 
Describe chronic interstitial encephalitis. 
There is a production of new connective tissue, neuroglia cells, and 
an atrophy of nerve elements. The lesion may occur diffusely or in 
circumscribed masses. 
How does tubercular inflammation appear in the brain ? 
Usually in the form of solitary tubercles with cheesy centres. 
How does syphilitic inflammation manifest itself in the brain ? 
By the formation of gumma tumors usually near the periphery of 
the brain. Sometimes it is characterized by the formation of a gela- 
tinous, grayish tissue made up of a homogeneous or granular basement 
substance containing numerous small, round cells. The arteries may 
be the seat of an obliterating endarteritis. 
What tumors have been found in the brain ? 
Gliomata, glio-sarcomata, myxomata, fibromata, lipomata, osteo- 
mata and endotheliomata. Sarcomata and carcinomata may occur 
as secondary growths. 
SPINAL CORD. 
What pathological changes are seen in the membranes investing 
the spinal cord ? 
The inflammatory changes are similar in variety and results to the 
inflammations occurring in the corresponding membranes investing 
the brain, with one exception. The dura mater spinalis is not adherent 
to adjacent bones and does not form their periosteum as does the cor- 
responding membrane in the cranium. Therefore, it is not as readily 
involved in inflammatory disturbances affecting the bones. The varie- 
ties of tumors found are the same as in the dura and pia mater of 
the brain. 
Do hemorrhages occur in the spinal cord? 
Yes, either as capillary hemorrhages or as apoplectic clots. The 
changes produced resemble those due to the same lesion in the brain. 
Give the classification of the inflammation of the spinal cord. 
Acute myelitis. 
Chronic myelitis. 
Tubercular inflammation, 
9—H.P.B. 
