. Elements of pathological anatomy. Anatomy. 284 ARTERIES. [chap. V. common pea.* There would thus seem to be occasionally a real aneurismal diathesis. Much diversity obtains in rela- tion to the dimensions of these sac-like projections: in some instances, as we have just seen, they are remarkably small, whilst, in others, they acquire the magnitude of a large egg, the fist, or even of a mature fetal head. The manner in which they are attached is also subjeet to considerable varia- tion. Very frequently they arise by a narrow foot-stalk ; at other times they repose upon a broad base,— the open
. Elements of pathological anatomy. Anatomy. 284 ARTERIES. [chap. V. common pea.* There would thus seem to be occasionally a real aneurismal diathesis. Much diversity obtains in rela- tion to the dimensions of these sac-like projections: in some instances, as we have just seen, they are remarkably small, whilst, in others, they acquire the magnitude of a large egg, the fist, or even of a mature fetal head. The manner in which they are attached is also subjeet to considerable varia- tion. Very frequently they arise by a narrow foot-stalk ; at other times they repose upon a broad base,— the opening be- tween them and the artery being always much larger in the latter than in the former case. The cylindro'id aneurism (Fig. 18) is of an elongated Fig. 18.+ spherical shape : the dilatation, which is pret- ty nearly uniform, embraces the entire cir- cumference of the vessel, varying in length from a few lines to several inches. The coats are generally somewhat thickened, and the inner surface of the tube is rough, uneven, and covered with thin, irregular layers or patches of fibrin. In some instan- ces, the dilatation is truly enormous. In a specimen of cylindro'id aneurism of the arch of the aorta, presented to me by my friend Dr. W. M. Charters, of Lebanon, in the State of Ohio, the tumor measures upwards of ten inches in circumference, by five and a half in length. It formed an immense ovoidal swelling in front of the neck, which extend- ed nearly as high up on the left side as the angle of the jaw ; whilst, below, it pressed upon and destroyed the inner half of the clavicle, part of the first rib, and a small portion of the breast bone. Almost all the arteries in the body are sometimes affected with this species of enlargement. In a man, fifty years of age, Dr. Geddings, the distinguished professor of pathological anatomy in the medical college of South Carolina, found not only the. * The subject in whom these dilatations were found was about fifty years of age. They
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