. The principles and practice of veterinary surgery . l texture,whether the diseased condition be a degeneration and dilatationof all the coats of the vessel, or an ulceration of one or more ofthem, leading to dilatation of the external fibrous coat. A false aneurism is nothing more or less than a woundedartery, the blood, prevented from escaping externally, becomingcoagulated in the areolar tissue, which becomes condensed, andforms a sort of cyst, though generally a very imperfect one,as in some cases the force of the blood-current dissects thetextures widely. The wound in the artery remains
. The principles and practice of veterinary surgery . l texture,whether the diseased condition be a degeneration and dilatationof all the coats of the vessel, or an ulceration of one or more ofthem, leading to dilatation of the external fibrous coat. A false aneurism is nothing more or less than a woundedartery, the blood, prevented from escaping externally, becomingcoagulated in the areolar tissue, which becomes condensed, andforms a sort of cyst, though generally a very imperfect one,as in some cases the force of the blood-current dissects thetextures widely. The wound in the artery remains open, and 586 DISEASES OF THE AETERIES AND LYMPHATICS. enlarges by degrees, so that pulsation is in this case also amarked feature in the tumour.—(Spence.) Many cases of aneurism in the horse are recorded, and mostcommonly aneurisms of the anterior mesenteric artery and pos-terior aorta have been met with. The accompanying drawing,which is taken from a specimen in the possession of ProfessorWalley, will illustrate the common situation of Fig. 109.—Aneurism of the posterior aorta, with calcareousdegeneration of the walla of the sac. a, Aorta, natural size. h, Small dilatation, with the out ends of the anterior mesen-teric and cceliac axis. c. Large aneurismal sac, laid open. There are records of scattered cases of aneurism in largenumbers, but the most interesting memoir bearing on this sub-ject appeared in the Vienna Quarterly of Veterinary Sciencefor 1852, by Dr. BruckmuUer. It refers to aneurism of theanterior mesenteric artery. Hering was the first to indicatethe frequency of this lesion, but Gurlt doubted the correctness /of Herings observations. Bruckmiiller examined carefully;from the 22d May to the 30th September 1851, 65 horses,with a view to determine the frequency of this aneurism, andiound only six animals perfectly free from it; 59, or 91 percent., had dilatation of the mesenteric artery to a greater orless extent. In 19 cases there was simple thicken
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