The pathology and surgical treatment of tumors . , a sweat-gland. they cannot be detected at the time of birth, but they soon begin toincrease in size, whereas the cavernous angiomata are not always con-genital and may develop at any time after birth. Their growth is beststudied in the subepithelial fat, where the tumor forms small cellularmasses of angioblasts and connective-tissue corpuscles. Cavernous Angioma.—The cavernous angiomata form tumors of 448 PATHOLOGY AND TREATMENT OF TUMORS. larger size than the capillary variety, and are composed of irregularblood-spaces which communicate freel
The pathology and surgical treatment of tumors . , a sweat-gland. they cannot be detected at the time of birth, but they soon begin toincrease in size, whereas the cavernous angiomata are not always con-genital and may develop at any time after birth. Their growth is beststudied in the subepithelial fat, where the tumor forms small cellularmasses of angioblasts and connective-tissue corpuscles. Cavernous Angioma.—The cavernous angiomata form tumors of 448 PATHOLOGY AND TREATMENT OF TUMORS. larger size than the capillary variety, and are composed of irregularblood-spaces which communicate freely with one another. The newblood-spaces are formed by angioblasts in the cellular connective angiomata are found in the deep connective tissue, in thebones, the liver, the spleen, and the kidney, and are composed of atissue almost identical with that of the corpus cavernosum penis—thatis, of irregular blood-spaces communicating freely with one another andseparated by fibrous septa of variable thickness (Fig. 322). The walls. Fig. 322.—Cavernous angioma of the liver; X 350 (after D. J. Hamilton): a, liver-cells at margin of thetumor; b, blood contained in the cavernous spaces; c, walls of the cavernous spaces. of the blood-spaces are lined by endothelium. The formation of newblood-spaces takes place in the fibrous septa and in the periphery ofthe tumor. Cavernous angioma is a much more formidable tumor thana superficial naevus, as its tendency to progressive growth is muchgreater and from its deeper location it involves more important struc-tures. A simple naevus may, however, later in life become convertedinto a cavernous angioma. Plcxiform Angioma.—Plcxiform angioma, which is a true angioma-tous tumor, and not an aneurysm, has been known as aneurysm or cirsoid aneurysm —terms that should no longer beemployed to designate an arterial angioma. Plcxiform angioma con- ANGIOMA. 449 sists of a number of tortuous blood-vessels of moderate si
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectneoplas, bookyear1895
