A manual of modern surgery : an exposition of the accepted doctrines and approved operative procedures of the present time, for the use of students and practitioners . n•of such aneurisms. Traumatic fusi-form aneurism seems to be almostan impossibility. Occasionally sev-eral fusiform aneurisms are devel-oped in connection with the sameartery, which is of normal caliberbetween the dilated regions. Thelateral blood pressure in fusiformaneurisms is comparatively moder-ate in amount; hence they growslowly and do not readily burst, but it is not unusual for a sacciformaneurism to be developed upon
A manual of modern surgery : an exposition of the accepted doctrines and approved operative procedures of the present time, for the use of students and practitioners . n•of such aneurisms. Traumatic fusi-form aneurism seems to be almostan impossibility. Occasionally sev-eral fusiform aneurisms are devel-oped in connection with the sameartery, which is of normal caliberbetween the dilated regions. Thelateral blood pressure in fusiformaneurisms is comparatively moder-ate in amount; hence they growslowly and do not readily burst, but it is not unusual for a sacciformaneurism to be developed upon the surface of a fusiform dilatation andto cause death by rupture. In cases of very large fusiform aneurismof the aorta death may also occur from syncope, because the heart isunable to give sufficient forward motion to the mass of blood containedin the large tumor. Hence the circulatory movement in the more dis-tant vessels is impaired and fatal syncope may supervene. The sacciform aneurism is the more common variety of the disease,and is that which is meant when the simple term-aneurism is aneurisms are so infrequent, and in comparison with the. Carotid aneurism with artery laid open to showthe orifice. (Scarpa.) 286 DISEASES AND INJURIES OF THE BLOOD VESSELS. sacciform variety so unimportant surgically, that further reference tothem is scarcely necessary. A sacciform aneurism is a sac or pouch developed upon one side ofan artery, by localized dilatation of the arterial wall, and communicat-ing with the interior of the vessel by a narrow orifice or mouth. Thecavity of the sac has a much greater diameter than its orifice of com-munication with the artery, and it is, therefore, usual to speak of thebody, neck and mouth of the aneurism. The walls of the sac mayrif the tumor is small, consist of all three arterial tunics ; but usually itis only the outer tunic and perhaps part of the thickness of the middletunic that form the sac. As internal pressure causes furthe
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