. Tumours, innocent and malignant; their clinical characters and appropriate treatment. cation of the bones of the cranialvault. In contrast, it should bementioned that the bone beneaththe exquisite crest of the crownedcrane is abnormally thick. Animportant condition often associ-ated with spina bifida occulta isperforating ulcer of the foot. In-deed, this association is now sowell recognized that in every caseof perforating ulcer of the foot,occurring in young patients, it isthe duty of the surgeon, as amatter of routine, to examine theloins. In addition to non-union of thearches in the vicin
. Tumours, innocent and malignant; their clinical characters and appropriate treatment. cation of the bones of the cranialvault. In contrast, it should bementioned that the bone beneaththe exquisite crest of the crownedcrane is abnormally thick. Animportant condition often associ-ated with spina bifida occulta isperforating ulcer of the foot. In-deed, this association is now sowell recognized that in every caseof perforating ulcer of the foot,occurring in young patients, it isthe duty of the surgeon, as amatter of routine, to examine theloins. In addition to non-union of thearches in the vicinity of spinabifida, the vertebrae are liable tobe defective in other ways, and ofthese defects the most striking isthe absence of half a vertebra—that is, half the centrum, with itspedicle, lamina, transverse, articularand spinous processes, is wholly wanting. The persistent half of such a vertebra has thecharacters shown in Fig. 347, and is often ankylosed to thevertebra above and below. Sometimes the half-vertebra is inexcess of the ordinary number. Exceptionally, a considerable. Fig. 344.—Spinal column insection with a sacral meningo-cele. The spinal cord is re-tained in the sacral section ofthe neural canal, its embryonicposition. From a child aged3 months. 646 PSEUDO-CYSTS extent of the column will be replaced by an alternatingseries of lialf-vertebree ; this is especially seen when the cer-vical portion of the column is the seat of spina bifida. Half-vertebra3 occur occasionally independently of spinabifida ; they have also been detected in the spines of snakes,calves, fish (sole), and rabbits. The aniount of disturbancesometimes caused in a vertebral column b}^ spina bifida isvery remarkable. Occasionally, horizontal ]3rocesses of bone project from the vertebral centrainto the neuial canal, and some-times transfix the cord. Severalexamples have been carefidlydescribed in which the cord hasbifurcated and coalesced againin order to enclose a beam ofbone crossino the ca
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectneoplasms, bookyear19
