The pathology and surgical treatment of tumors . asitic cysts do not come under the head of retention-cysts. They are inflammatory products, and have no place in a treatiseon tumors. The writer will therefore exclude from this section thehydroceles, diverticula, bursae, neural cysts, and parasitic cysts. A trueretention-cyst can form only in organs that produce a physiologicalsecretion or excretion which is discharged by an outlet upon the skinor upon a mucous or serous surface; in other instances the secretionis absorbed at the place where it is produced. The only instance in which, normally,
The pathology and surgical treatment of tumors . asitic cysts do not come under the head of retention-cysts. They are inflammatory products, and have no place in a treatiseon tumors. The writer will therefore exclude from this section thehydroceles, diverticula, bursae, neural cysts, and parasitic cysts. A trueretention-cyst can form only in organs that produce a physiologicalsecretion or excretion which is discharged by an outlet upon the skinor upon a mucous or serous surface; in other instances the secretionis absorbed at the place where it is produced. The only instance in which, normally, a glandular secretion is dis-charged into a serous cavity is furnished by the Graafian follicles of theovary. The secretion of the follicles of the thyroid gland in a normalcondition is absorbed; but if, for any reason, absorption is suspended,the follicles become dilated and eventually form retention-cysts. Histology,—The cyst-wall is composed of the connective tissue,basement membrane, and epithelial lining of the follicle, tubule, Fig. 472.—Wall of atheromatous cyst fafttr Boyce) : a, fibrous wall :transformation of epithelium. (Obj. ^ inch, v i>, epithelial layer ; c, horny amorpli-ithout eye-piece.) or duct which has become obstructed. The amount of connective tis-sue as compared with the normal structure of the part affected variesgreatly. If the is acute and the part on the distal side con-tinues to .secrete, the spaces, according to the activity ofthe physiological function of the part affected, dilate rapidly, resultingin distention of the gland or duct, with thinning of the wall. If forms slowly and the amount of the retained secretion RE TENTION-CYSTS. 651 accumulates slowly, the cyst-wall is often enormously thickened by theformation of new connective tissue. The best illustration of the formercondition is furnished by acute hydronephrosis, and of the latter bysebaceous cysts. The epithelial cells which lin
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectneoplas, bookyear1895
