. Elements of pathological anatomy. Anatomy. CHAP. VI.] PHLEB0L1TES. 297 Fig. 25 * oral vein; Macartney and Andral in the external saphen- ous vein. Whether the venous tissues are liable to the athero- matous degeneration, so common in the arterial, I am not pre- pared to say ; probably they are not: at all events, I am not acquainted with a single instance of it on record, nor have I met with it in my own dissections. A sort of fatty substance is occasionally found. Andral once saw a tumor of this de- scription, about the size of a walnut, which exhibited all the anatomical characters of the
. Elements of pathological anatomy. Anatomy. CHAP. VI.] PHLEB0L1TES. 297 Fig. 25 * oral vein; Macartney and Andral in the external saphen- ous vein. Whether the venous tissues are liable to the athero- matous degeneration, so common in the arterial, I am not pre- pared to say ; probably they are not: at all events, I am not acquainted with a single instance of it on record, nor have I met with it in my own dissections. A sort of fatty substance is occasionally found. Andral once saw a tumor of this de- scription, about the size of a walnut, which exhibited all the anatomical characters of the adipous texture. It was devel- oped in the substance of the great portal vein, the cavity of which it almost filled. Loose concretions, phlebolites, (Fig. 25,) or vein-stones, varying in size from a currant to a pea, are occasionally found in the interior of these tubes. Common- ly of a yellowish, brownish, or bluish color, they are of a hard and brittle consistence, and of an oblong, oval, or spherical form, with a smooth, even surface. When divided by the saw, they are found to be made up of several thin but distinct lamellae, dispos- ed concentrically around a small delicate nucleus, frequently con- sisting of fibrin. The number of these calculi is extremely variable ; rarely are there more than two or three, though occasionally as many as eight or ten, have been observed. In a case examined by Tiedemann, there were thirty-six. They are generally met with in the smaller veins ; more frequently, perhaps, in the spermatic, uterine, vaginal, vesical, hemorrhoidal, and splenic, than in any other. Ac- cording to the analysis of Gmelin, which has been recently confirmed by that of Dr. Prout, vein-stones are composed principally of phosphate and carbonate of lime, with a small amount of animal matter, probably albumen, and a trace of the oxide of iron. A difference of opinion still prevails re- specting their mode of origin. Some suppose that they are. * «,'broad ligament of uteru
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