A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . equently affected, presentingnodular thickenings. Jlicro-scopically the media and ad-vcntitia are inliltrated withround cells, the intima is thick-ened and hyaline, anil the vasaBacilli are found in all threetherefore to be regarded as a vasorum are thickened,layers. The process isbacillary invasionphlebitis. \SITES. — Echi-nococcus cysts of theliver not infrequentlybreak into the hepaticvein and give rise tometastases in the rightheart and lungs. Thecysticercu
A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . equently affected, presentingnodular thickenings. Jlicro-scopically the media and ad-vcntitia are inliltrated withround cells, the intima is thick-ened and hyaline, anil the vasaBacilli are found in all threetherefore to be regarded as a vasorum are thickened,layers. The process isbacillary invasionphlebitis. \SITES. — Echi-nococcus cysts of theliver not infrequentlybreak into the hepaticvein and give rise tometastases in the rightheart and lungs. Thecysticercus. filaria san-guinis hominis, anddistoma hivmatobiumare also found in theveins. Foreign Bodies.—Under very rare condi-tions foreign bodieswhich have enteredthe veins may be foundattached to the wall ofthe vessel. One caseis leported of the find-ing of a small pistolbullet in the internaljugular. New Growths. —Haimangiomata, a n -giosarcomata. and en-dotheliomatamay be pri-mary in veins,particularlythe smallestV e ins. P r i -mary myomataof veins havealso been de-scribed. Man)of the re-ported as pri-mary tumors. Fig. 5019.—Changes in Inferior- \ena Cava dueto Syphilis. (After Schrotter.) REFERENCE HANDBOOK OP THE IVIEDICAL SCIENCES. of veius are of doubtful nature, it being very probablethat the vein walls were secondarily involved. In sofar as the metastasis of tumors is concerned, the veinsplay a much more important part than the secondary involvement of veins by primary carci-noma and sarcoma of other organs and tissues is of verycommon occurrence. In the extension of the tumor intothe vessel wall rupture of the tumor cells into the lumenis prevented for a long time by the endothelium, which isapparently very resistant to the advancing tumor nodulesmay project into the lumen of the vein,buton microscopical examination the endothelium willbe found intact over the growth. Carcinomata breakthrough the walls of large veins
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