General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . sses of epithelial cells. It is usuallybenign, but may infiltrate and cause atrophy of the jaw, and some-times become sarcomatous. Endotheliomata Endotheliomata are tumors derived from endothelium of bloodand lymphatic vessels, also the nicsothelium of serous membranes,and hence are called hemangioendotheliomata, lymphangioendo-theliomata, peritheliomata (from the perivascular lymph spaces)and mesotht liomata. TiM(»i;s 117 In addition to the general locations ment
General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . sses of epithelial cells. It is usuallybenign, but may infiltrate and cause atrophy of the jaw, and some-times become sarcomatous. Endotheliomata Endotheliomata are tumors derived from endothelium of bloodand lymphatic vessels, also the nicsothelium of serous membranes,and hence are called hemangioendotheliomata, lymphangioendo-theliomata, peritheliomata (from the perivascular lymph spaces)and mesotht liomata. TiM(»i;s 117 In addition to the general locations mentioned, they occur inthe meninges, periosteum, bone marrow and other parts. Whilenorma] endothelial cells are elongated and thin, forming a mo-saic over the surfaces which they line, in the new growths thecells become cuboidal, cylindrical, and irregular in shape. Theymay occur in tubular masses, or in several layers with an openlumen here ami there, or in solid alveolar masses resemblingcarcinoma. Pig. 54. A psammoma is usually an endothelioma, occurring in themeninges ami other parts of the brain, consisting of closely ?r. Fig. 54.—Endothelioma of the dura mater. a. connective-tissue stroma; b, small-ceiled focus; c, proliferated endothelium from lymph vessels; d, endothelial strand withlumen; c, area of fatty degeneration; /, endothelial cells passing into the connective tis-sue on the right. (ZieglerJ packed concentric masses of cells or whorls. They contain gran-ules of calcareous matter i brain sand). Any type of tumor how-ever in these locations containing calcareous granules is calleda psammoma. The stroma of endotheliomata may become hyaline, myxoma-tous, fibrous or cartilaginous, or may atrophy, leaving the en-dothelium and blood vessels as the main features. Such tumorsin which hyaline or mucoid material occurs in cylindrical massesare often called cylindromata. Endotheliomata are usually benign. 148 GENERAL PATHOLOGY Teratomata Teratomata are tumors of complex or
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