American practice of surgery : a complete system of the science and art of surgery . adherent to theskin, and the cutis covering it is thin, smooth, and of a whitish or pinkish color. Histologically, keloid is a fibroma originating in the corium and, it is believed,from the fibrous adventitia of the vessels of the corium. Tlie older ])ortions ofthe growth are of the type of the fibroma durum, but in the younger parts theVOL. I.—20 306 AMERICAN PRACTICE OF SURGERY. tumor is more cellular. The various layers of the coriuni, papillse and rete pegs,remain intact. Keloitl tends to progress for a nu
American practice of surgery : a complete system of the science and art of surgery . adherent to theskin, and the cutis covering it is thin, smooth, and of a whitish or pinkish color. Histologically, keloid is a fibroma originating in the corium and, it is believed,from the fibrous adventitia of the vessels of the corium. Tlie older ])ortions ofthe growth are of the type of the fibroma durum, but in the younger parts theVOL. I.—20 306 AMERICAN PRACTICE OF SURGERY. tumor is more cellular. The various layers of the coriuni, papillse and rete pegs,remain intact. Keloitl tends to progress for a number of years, when it may become station-ary. It rarely involutes spontaneously. Myxomata are tumors of mucoid character. Structurally, they are composedof cells floating in a liomogeneous, semifluid, mucinous matrix. The cells aremononuclear, bipolar or stellate, and provided with more or less elongated proto-plasmic processes which interlace freely (Fig. 86). The intercellular substancevaries in amount in different tumors and in different parts of the same Fig. 86.—M\-xoma. Wiiifkel No. 6, without ocular. (From the authors collection.) When abundant it gives a characteristic gelatinous, semifluid, somewhat trans-lucent aj^jxarance to the growth. ]\Iyxomata are grayish or pinkish-gray incolor, owing to the presence of blood-vessels that are more or less distinctly vis-ible in the substance. On section, a jelly-like or ropy substance—mucin—exudes, which is not solul)le in water and gives a whitish precipitate whentreated with alcohol or dilute acetic acid. Myxomata are rarely pure in type, but are usually combined with other tis-sues of a homologous iiature, such as fibrous tissue (fibro-myxoma), fat (myxomalipomatodes; lipo-myxoma), or cartilage {cliondro-myxoma). Mucoid tissue is related to fibrous :.sue. The truth of this is evidentwhen we remember that in the f(rtus the fibrous and fatty tissues are first blockedout in mucoid materia
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