. Elements of pathological anatomy. Anatomy. CHAP. v.] SACCULATED ANEURISM. 283 Fig. 17* quently even the capillaries. Aneurismal enlargements may be divided into four principal species,— the sacculated.'cylindroid, varicose, and anastomotic. To these may very properly be added another, namely, the arterio-venous, or that form of the disease which has been described by writers, since the time of Dr. William Hunter, under the name of aneurismal varix. When a tumor of this kind is composed of all the arterial tunics, it is called a true aneurism; if, on the other hand, it consists only of the ex
. Elements of pathological anatomy. Anatomy. CHAP. v.] SACCULATED ANEURISM. 283 Fig. 17* quently even the capillaries. Aneurismal enlargements may be divided into four principal species,— the sacculated.'cylindroid, varicose, and anastomotic. To these may very properly be added another, namely, the arterio-venous, or that form of the disease which has been described by writers, since the time of Dr. William Hunter, under the name of aneurismal varix. When a tumor of this kind is composed of all the arterial tunics, it is called a true aneurism; if, on the other hand, it consists only of the external coat, the inner and middle being ruptured, ulcerated, or destroyed, it is denominated a false aneurism. Of these two varieties, the latter is by far the most common. Cases occasionally occur, though rarely, where, in consequence of the laceration of the fibrous mem- brane, the internal coat is protruded across the crevice, in the form of a hernia, which gradually encroaches upon the cellu- lar membrane, and thus dilates it into a distinct pouch. In the sacculated aneurism, (Fig. 17,) the coats of the artery are dilated into one or more pouches, occupying only a limited portion of its circumfer- ence. It occurs most frequently in the great trunks, particu- larly the thoracic aorta, and occa- sionally affects all the principal branches of the body. M. Pel- letan, a French surgeon, examin- ed an individual, in whom he dis- covered upwards of sixty of these dilatations; and a still more extraordinary example has re- cently been reported by Professor Cloquet, of Paris. In this case, the number of tumors was upwards of two hun- dred, the largest of which did not exceed the volume of a. Sacculated aneurism: a, the artery; b, the aneurismal Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gross, Samu
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