The principles of surgery . mouths of large veins, and other arborescent vessels. The arrangement of the morbidmass is generally even and , the tumor is foundto consist of cells similar to thoseof the hard cancer; but usuallyaccompanied by much more fluid,and less fibrous tissue; and hencethe soft and yielding character ofthe growth. The cells may haveevery grade of development, fromthe earliest and youngest, to theretrograde condition. Sometimesit is surrounded by a cyst; if so, the cyst is usually imperfect, at one ormore points, and there the tumor has plainly increase
The principles of surgery . mouths of large veins, and other arborescent vessels. The arrangement of the morbidmass is generally even and , the tumor is foundto consist of cells similar to thoseof the hard cancer; but usuallyaccompanied by much more fluid,and less fibrous tissue; and hencethe soft and yielding character ofthe growth. The cells may haveevery grade of development, fromthe earliest and youngest, to theretrograde condition. Sometimesit is surrounded by a cyst; if so, the cyst is usually imperfect, at one ormore points, and there the tumor has plainly increased more rapidlythan elsewhere. More frequently there is no envelope ; the surroundingtextures having not been pushed aside, but drawn into the structuralchange. It is not unusual to find one or more dense fibrous bands in-tersecting the mass ; but these are not to be regarded as a part of theoriginal tumor; they are accidental, and owe their existence to theapproach and union of two or more medullary masses, between which a. Medullary tumor beneath the mamma; a, thetumor; b, the mamma. MEDULLARY TUMOR. 191 Fig. 82. part of the original textures, much condensed, still remains free from themedullary change. At first the mass is homogeneous. But after atime softening occurs, at one or more points, by imperfect suppuration;and there the consistence and color resemble somewhat those of cream ;not unfrequently, however, of a much darker hue, by admixture ofblood. Blood also is often found in masses, not fluid, but coagulated;sometimes it is infiltrated diffusely throughout the morbid structure;signs always of evil omen, indicative of much malignancy, and analmost certain return. In tumors of any considerable duration, cavities may always be ex-pected, more or less numerous. They are of two kinds; mere spaces,formed by softening of the medullary substance, and occupied by thissoftened matter variously mixed with blood,solid or liquid; or true cysts, lined by a secret-ing membrane, and
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