. The elements of pathological histology with special reference to practical methods . Fig. 36.—Alveolar Endothelial Sakcoma of the Pleura, startingFROM THE Endothelium of the Lymphatics. x 285. (Stained withalum cochineal.) a, Eudothelioid sarcoma cells, seen laterally ; 6, Sarcomacells, seen on the flat; c. Connective-tissue stroma. the lumen is absent,. and when the columns of cells appear in thesections cut for the most part transversely and consequently rounded,a great resemblance to carcinoma may arise. In many sarcomata of the meninges and brain the eudo-thelioid cells combine to form g
. The elements of pathological histology with special reference to practical methods . Fig. 36.—Alveolar Endothelial Sakcoma of the Pleura, startingFROM THE Endothelium of the Lymphatics. x 285. (Stained withalum cochineal.) a, Eudothelioid sarcoma cells, seen laterally ; 6, Sarcomacells, seen on the flat; c. Connective-tissue stroma. the lumen is absent,. and when the columns of cells appear in thesections cut for the most part transversely and consequently rounded,a great resemblance to carcinoma may arise. In many sarcomata of the meninges and brain the eudo-thelioid cells combine to form globular concentrically-laminatedstructures (Fig. 37, a). Should a deposition of lime salts thentake place in these, so that concretions resembling brain sand 92 TUMOURS OR NEW-FORMATIONS (b) are formed, they are spoken of as psammomata or 2^ Fig. 37.—Endothelial Sarcoma of the Dura Mater, x 240. (Stained withhajmatoxylin and eosin.) a. Concentrically stratified endothelial cells; h, Con-centrically stratified concretions. 16. (v.) The Angio-sarcoma.—All those sarcomata which are veryrich in blood-vessels may be described as angio-sarcomata. In themthe sarcomatous tissue often conies into more intimate connectionwith the blood-vessels, enveloping their lumen like a coat. Inother cases the blood-vessels show dilatations of different forms(teleangiectatic sarcoma) or a liyaline degeneration of their walls (, h) \ and in the latter the vessel-wall may swell to the totalobliteration of the lumen, so that hyaline cylinders and bulbs are left(cylindroma^ Fig. 38, c). When, as is often apt to be the case, the walls of the blood-vesselsare very delicate, haemorrhages may readily occur (Fig. 39, c), and inmany sarcomata are so extensive that the proper sarcomatous tissue,especially in larger tumours, is almost entirely de
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpatholo, bookyear1895
