1776. Thibert's model. Double aneurism of the aorta, forming two large pouches. The one in the ascending portion con- tains no coagula. The second, which is just beyond the arch, contains a large old clot that is hollow in the cen- tre ; and the entrance into the descending aorta is quite abrupt. In the first sac are small ossific patches through- out the internal surface. Orifices of the heart healthy. 1849. Dr. J. Ware.
1777. Aneurism of the asc. aorta, that must have been at least
half as large as the fist ; cavity filled with fibrine. Orifice just above the valves, about an inch and a half in diame- ter, circular, and very defined. The sac presses upon, and distends the pulmonary artery so as almost entirely to ob- literate the valves. It also presses upon the right ventricle below the valves, as shown in the preparation ; and it evi- dently might, at some future time, have ruptured at either point. 1847. Dr. J. C. Warren.
1778. The heart, with the ascending portion and arch of the
aorta, dilated into a true aneurismal sac, that is larger than the two fists ; the inner surface of the sac showing small cretaceous plates, and looking altogether like that of a common diseased artery. From the upper part of the sac a false aneurism arises, with a defined orifice, and pressing against the' lower half or more of the trachea. The vessels that arise from the arch seem healthy. 1861.
1779. Aneurism of the arch of the aorta ; opening into the
trachea.
From a strong, healthy man, about forty-five years of age, and who had had palpitation, with increased and irreg- ular action of the heart " for years." Whilst sitting quietly, he coughed twice, blood poured from his mouth, and in a few minutes he died.
The sac, which is about the size of a goose-egg, arises from the back of the aorta ; and the opening into the tra- chea is between one and two lines in diameter, and 1J in. above the bifurcation. There are old fibrinous clots in the cavity ; and the vessels at the arch arise from near the mouth of the sac. 1867. Dr. H. G. Clark.
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