TUBERCULAR MENINGITIS. 



423 



tory process may extend to the substance of the brain, vary- 

 ing from slight oedema of the cortex to abscess-formation. 



Tubercular inflammation of the meninges is more common 

 in children than in adults, and is usually part of a general 

 miliary tuberculosis or secondary to tuberculosis of other 



FIG. 195. 



- a 



6 



Serous leptomeningitis. a, cedematous fibrous tissue of the pia mater, the fibrous 

 elements of the tissue being separated by the serous exudate ; 6, group of leuko- 

 cytes, probably held together in part by fibrin ; c, granular fibrin and detritus : 6 

 and c and other similar masses, lie in the serum, which occupies the whole 

 field between the visible elements (Dunham). 



regions of the body, most commonly the lungs. The miliary 

 tubercles are most numerous in the pia at the base of the 

 brain. The meninges are congested, and may be the seat of 

 exudations similar to those occurring in simple meningitis. 

 The ventricles of the brain are distended with a serous exu- 

 date and their walls studded with miliary tubercles. The 



