The pathology and surgical treatment of tumors . Fig. 315.—Composite odontome froma young lady aged eighteen ; natural size(after Heath). XXIII. ANGIOMA. Definition.—A71 angioma is a tumor composed of blood-vessels pro-duced from a matrix of aitgioblasts. Angiomata were formerlydescribed as teleangiectasia, angiotelectasia, angioma pleni-forme, erectile tumors, and nsevi. Virchow included all vasculartumors under the head of angioma. Tumors composed of lymphaticvessels are called lymphangioma, to distinguish them from tumorscomposed of blood-vessels, and this is what is generally understoodby
The pathology and surgical treatment of tumors . Fig. 315.—Composite odontome froma young lady aged eighteen ; natural size(after Heath). XXIII. ANGIOMA. Definition.—A71 angioma is a tumor composed of blood-vessels pro-duced from a matrix of aitgioblasts. Angiomata were formerlydescribed as teleangiectasia, angiotelectasia, angioma pleni-forme, erectile tumors, and nsevi. Virchow included all vasculartumors under the head of angioma. Tumors composed of lymphaticvessels are called lymphangioma, to distinguish them from tumorscomposed of blood-vessels, and this is what is generally understoodby the unquahfied term angioma. The definition excludes fromthis class of tumors all swellings caused by dilatation of pre-existingblood-vessels, aneurysm, and varicose veins. The angiomatous tumor. Fig. 316.—Angioma of tongue, showing ncwiy-furmed blood-spaces not yet in connection with pre-existing vessels; X 330 (Surgical Clinic, Rush Medical College, Chicago): a, angioblast ; b, newly-formedspaces filled with delicate fibrous network and amorphous material. is composed of new blood-vessels which are in communication withthe adjacent vessels, interstitial tissue composed of the pre-existingtissues in which the tumor develops, and the blood contained in thevascular spaces. The size of the tumor is very variable at different 442 ANGIOMA. 443 times and under different circumstances, according to the anatomicalstructure of the vessels and the amount of blood the vessels contain. Histogenesis.—Weil in a study of the growth of angioma cameto the conclusion that the origin of new blood-vessels is as variable asis the formation of new embryonal vessels. He found projectingfrom the wall of old and new capillary blood-vessels streaks of proto-plasm which showed nucleated projections
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectneoplas, bookyear1895
