. Diseases of the stomach : including dietetic and medicinal treatment . erately succulent, very proneto hemorrhage, and often the seat of extensive ulceration. Occasionallythey occur in girdle form about the central portion of the stomach,or near the pylorus. Like the other varieties, adenocarcinoma may 220 CAXfER OF THE STOMACH infiltrate the stoinacli walls diHuscly. In this form the jnlorus isusually thiekened and rigidly ])atent rather than contracted. On microscopical examination, the tumor is seen to consist of numer-ous large alveoli of various shapes and sizes in a fine stroma of fibr
. Diseases of the stomach : including dietetic and medicinal treatment . erately succulent, very proneto hemorrhage, and often the seat of extensive ulceration. Occasionallythey occur in girdle form about the central portion of the stomach,or near the pylorus. Like the other varieties, adenocarcinoma may 220 CAXfER OF THE STOMACH infiltrate the stoinacli walls diHuscly. In this form the jnlorus isusually thiekened and rigidly ])atent rather than contracted. On microscopical examination, the tumor is seen to consist of numer-ous large alveoli of various shapes and sizes in a fine stroma of fibroustissue, rich in bloodvessels. While in many parts of the tumor the cellsmay be atypical in shape, one can find alveoli, generally in the deeperlayers, lined with ty))ical columnar epithelium. Colloid Carcinoma.—This type is more uncommon and represents adegeneration form. It may occur late or so early that even the growingedge of the tumor presents a gelatinous appearance. It generally in-vades all the coats of the stomach, and spreads rapidly to adjacent Fig. 40. Extcnsivo colloiil, sliDwing the incroasod thickness of the stomach of Mt. Sinai ) (From tho P!itli()l<)(;ii-:il tissues, especially the omentum and peritoneimi. The mucosa is gen-erally thickened and may l)e very rough, witli irregular protuberancesin extreme cases resembling polyposis. On section the thickened wallsappear honey-combed with larger and smaller alveoli, filled with yellowishor brownish gelatin() material which oozes out on pressure. Colloidcarcinoma may appear as a circumscribed mass of light brown colorand slimy consistence. On microscopical examination one sees various sized alveoli, more orless completely filled with the jxculiar strings- colloid material. Hereand there, many ahcoli liaxc aliiiost coinplctcly disintegrated, leaxing IATIIOLOdY 221 large spaces filled with colloid and showing irregular loops or strandsof epithelial cells. These cells often show gra
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