The principles of surgery . e contents of the affected trunk,vital power would be brought much lowerthan it is. But the diminished volumeof the main stream is compensated, byenlargement of the side channels. Whatis termed the collateral circulation—atall times existing—is amplified to atonefor the deficiency. Collateral branches,arising above the tumor, enlarge; andpassing round the aneurism, pour theirincreased contents again into the maintrunk. Some inches beyond the tumor,the arterial canal again shows its normaldimensions; and the circulation is ulti-mately the same ; only, at and aroundth
The principles of surgery . e contents of the affected trunk,vital power would be brought much lowerthan it is. But the diminished volumeof the main stream is compensated, byenlargement of the side channels. Whatis termed the collateral circulation—atall times existing—is amplified to atonefor the deficiency. Collateral branches,arising above the tumor, enlarge; andpassing round the aneurism, pour theirincreased contents again into the maintrunk. Some inches beyond the tumor,the arterial canal again shows its normaldimensions; and the circulation is ulti-mately the same ; only, at and aroundthe tumor, it is partly direct and partlycircuitous. The tumor has not existed for anyvery long time, before its contents beginto assume, in part, the solid form. Fi-brin is separated, and becomes arrangedin concentric laminae. Part is incorpo-rated with the inner surface of the cyst; strengthening it, as before stated; it loses its coloring matter, andbecomes connected with the cyst by both organic arrangement and vascu-. Aneurism, by dilatation. The abnormalspace almost entirely filled up by fibrin;the arterial canal remaining clear. Spon-taneous cure in advanced progress. 490 PROGRESS OF ANEURISM. larization. But the greater bulk of the fibrin is not incorporate!with the living texture; if it be adherent, it is only partially; mostfrequently it is loose in the cavity, with fluid blood playing roundit; arranged in laminae distinctly concentric, with the interior greatlydeprived of its coloring matter. In consequence of this accumula-tion of solid fibrin, the pulsation and compressibility of the tumorare affected. The former may be somewhat less distinct at certainpoints than at others, according to the form and adhesion of the clot;and if the clot be both dense and large, while the aperture of commu-nication between the cyst and artery is small, very little diminutionof bulk may be effected even by energetic pressure. This state ofmatters, however, is no disadvantage ; on t
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