General surgery and pathology for dentists . Fig. 18. FIBRO-ADENOMA OF THE BREAST, Showing Ducts and Dilated Acini. than a normal gland would), is very rare. There is nearlyalways an excess of connective tissue which may be eitherfibrous (adenOfibroma)^ mucous {adeno-myxoma), or sarco-matous (adeno-sarcoma). The gland tissue itself may be 88 PATHOLOGY AND SURGERY. either acinous in structure like that of the breast (see Fig. 18)or tubular like the follicles of the rectum. Adenomata are innocent tumours, unless their connectivetissue is sarcomatous, in which case they are malignant, themalignan
General surgery and pathology for dentists . Fig. 18. FIBRO-ADENOMA OF THE BREAST, Showing Ducts and Dilated Acini. than a normal gland would), is very rare. There is nearlyalways an excess of connective tissue which may be eitherfibrous (adenOfibroma)^ mucous {adeno-myxoma), or sarco-matous (adeno-sarcoma). The gland tissue itself may be 88 PATHOLOGY AND SURGERY. either acinous in structure like that of the breast (see Fig. 18)or tubular like the follicles of the rectum. Adenomata are innocent tumours, unless their connectivetissue is sarcomatous, in which case they are malignant, themalignancy depending not on the epithelial but upon theconnective tissue elements. Treatment. Removal by operation. Carcinoma. Carcinomata are tumours composed of epithelial cellsarranged in clusters within spaces or alveoli formed by con-nective tissue. The individual epithelial cells lie in immediatecontact with one another, not being separated by any matrixor intercellular substance. They vary in size and shape, and. Fig. CARCINOMA (EPITHELIOMA.) Processes of epithelium are growing down into the subjacent connec-tive tissue and muscle. The largest one contains a cell nest. The neigh-bouring tissues contain an excess of small round cells. usually resemble the natural epithelium from which theyarise. They are said to multiply both by fission and byendogenous cell formation. The fibrous tissue of which the PATHOLOGY AND SURGERY. 89 alveolar walls are composed contains blood vessels and lymph-atics. There are three chief varieties of carcinoma, and theydiffer from each other chiefly in the character of the cellsv^^hich are found in the alveoli. 1. Squamous-cblled Carcinoma. This variety is usuallycalled epithelioma ; it is composed of masses or columns ofsquamous epithelial cells resembling those seen in the columns grow from the interpapillary processes of skinor mucous membrane, and extend into the subjacent tissues,where they throw oat lateral branches w
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