General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . They occur frequently in tumors, infarcts, etc., and mayfollow hemorrhages (hemorrhagic cysts). 3. Parasitic Cysts.—Necrotic softening occurs, irritation causesthe formation of a capsule, and the liquid contents contain epi-thelial debris and parasites. Such are the hydatid cysts, due tothe tenia echinococcus, occurring usually in the liver, less often else-where; also cysts of the trichina spiralis, usually of small size,just visible to the naked eye, and occurri
General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . They occur frequently in tumors, infarcts, etc., and mayfollow hemorrhages (hemorrhagic cysts). 3. Parasitic Cysts.—Necrotic softening occurs, irritation causesthe formation of a capsule, and the liquid contents contain epi-thelial debris and parasites. Such are the hydatid cysts, due tothe tenia echinococcus, occurring usually in the liver, less often else-where; also cysts of the trichina spiralis, usually of small size,just visible to the naked eye, and occurring within the muscletissues. 4. Glandular Cysts, or Cystomata.—These are adenomata,which tend to cyst formation. They occur usually in the ovary TUMOKS i r, i and testicle, but may be found in any glandular tissue. Theymay be single or multiple, and each may consist of one or manycavities (multilocular cysts). They vary in size up to that of achilds head or Larger. On section a more or less serous, some-times hemorrhagic fluid, or a gelatinous material (usually re-ferred to as colloid) may be seen. The inner surface may. Fig. 57.—Cyst of the parovarium: there is no distortion of the ovary; the Fallopian tubehas been much elongated. be smooth, or present papillomatous outgrowths (papuliferouscysts or cystomata). Microscopically, the cysts are lined with typical, or variouslymodified, columnar epithelium, supported upon a framework ofconnective tissue. The latter may greatly predominate, causingthe cysts to be very small, or the acini few; again the oppositemay be true. Cysts are benign, though some have a tendency to become car-cinomatous. CHAPTER VIII THE PATHOLOGY OF INFECTIOUS DISEASES An Infectious Disease is one that is caused by living micro-organisms. A Contagious Disease is an infectious disease that isreadily transmitted from one individual to another by directcontact, by fomites, etc. Any organism that lives upon or within the living tissues ofplant or animal is
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