Organic and functional nervous diseases; a text-book of neurology . J-ovrer-pariof Ccuvvfy ^ -Lowerpartt| ofCcwUy Lower horn,ofyintricie Extensive bilateral porencephalus. The cavity within the brain communicated with theexternal surface at A. (Richter, Arch. f. Psych., xxxii.) Fig. Superior surface of a brain of a congenital iiuljccile who had hcmii>lcgia and epilepsy. The entireright liemispherc is atroi)hiod. C is the arachnoid, which was thickened and fonucd thq wall of a cysticcavity in the hemisphere. (Fcrraro.) 520 THE CEBEBBAL ATBOPEIES OF CHILDHOOD. cephalus. It is a rare con
Organic and functional nervous diseases; a text-book of neurology . J-ovrer-pariof Ccuvvfy ^ -Lowerpartt| ofCcwUy Lower horn,ofyintricie Extensive bilateral porencephalus. The cavity within the brain communicated with theexternal surface at A. (Richter, Arch. f. Psych., xxxii.) Fig. Superior surface of a brain of a congenital iiuljccile who had hcmii>lcgia and epilepsy. The entireright liemispherc is atroi)hiod. C is the arachnoid, which was thickened and fonucd thq wall of a cysticcavity in the hemisphere. (Fcrraro.) 520 THE CEBEBBAL ATBOPEIES OF CHILDHOOD. cephalus. It is a rare condition, secondary to meningitis or to mal-development of the brain, and not infrequently the fluid is poured outto fill the space left between an atrophic brain and the cranium. Thecommon form of hydrocephalus is interaal hydrooephalus, that is a dis-tention of the ventricles of the brain by an exudation of serum intothem. Internal hydrocephalus may be acute or chronic. The acute formis always due to meningitis, either simple or tuberculous (see ChapterXLI,). The chronic form may be secondary to a mild meningitis orependymitis, the original disease resulting in an adhesion within theventricles, which closes one of the foramina and prevents the free Fig. 232.
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