The pathology and surgical treatment of tumors . tents of cyst. nective tissue lined on the inside with epithelial cells. In most instancesthe epithelium lining the cyst-wall and contained in the cyst-contentsrepresents the epithelium of the skin (Fig. 446); but Rehn discovered,in a blind congenital fistula ending near the mucous membrane of thepharynx, ciliated epithelium, which, of course, must have been derivedfrom the pharynx. Neumann found cylindrical and pavement epithe-lium in two tumors of the neck ; one of the tumors was con-genital, while the other was developed in later year
The pathology and surgical treatment of tumors . tents of cyst. nective tissue lined on the inside with epithelial cells. In most instancesthe epithelium lining the cyst-wall and contained in the cyst-contentsrepresents the epithelium of the skin (Fig. 446); but Rehn discovered,in a blind congenital fistula ending near the mucous membrane of thepharynx, ciliated epithelium, which, of course, must have been derivedfrom the pharynx. Neumann found cylindrical and pavement epithe-lium in two tumors of the neck ; one of the tumors was con-genital, while the other was developed in later years. The presenceof ciliated epithelium may be explained by assuming its origin to havebeen in the upper part of the cleft, the fornix pharyngis, where these TERATOMA. 617 fistulae oftentimes end and where ciliated epithelium normally lower end was probably derived from the skin, and was lined withflat cells. The physical and chemical properties of the cyst-contents willdepend largely on the kind and degree of regressive transformation. Fig. 446.—Contents of branchial cyst; X 140. of the epithelial proliferation. In making the character of the cyst-contents a basis for classification it is, however, important to rememberthat, as in ordinary retention-cysts, the contents of a branchial cyst arehable to undergo changes depending on the retrograde changes of theepithelial product, on hemorrhage and other transudations into the sac,or on the occurrence of inflammation in the cyst-wall itself It is onlyduring the earliest stages that the characteristic secretion is found inits purity. In the course of time the original character of the cyst-contents may be lost completely by retrograde metamorphosis or by theaddition of new material. Clinical experience and pathological investigations have shown thatbranchial cysts, according to the physical properties of their contents,may be divided into the following principal varieties : i. Mucous cysts;2. Atheromatous cysts; 3. Serou
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectneoplas, bookyear1895
