The pathology and surgical treatment of tumors . normal blood-vessels the angioblasts furnish theessential tissue-elements of blood-vessels ; the blood-vessels reach theirrequisite normal size, when the process becomes stationary. The angio-blasts from which an angioma develops observe no such limitation offunction ; their function is a progressive one, and their product of tissue-proliferation results in the formation of atypical blood-vessels which arenot required by the part in which they are produced, and which con-stitute the essential tumor-tissue. The vascular spaces, whether capil-lary
The pathology and surgical treatment of tumors . normal blood-vessels the angioblasts furnish theessential tissue-elements of blood-vessels ; the blood-vessels reach theirrequisite normal size, when the process becomes stationary. The angio-blasts from which an angioma develops observe no such limitation offunction ; their function is a progressive one, and their product of tissue-proliferation results in the formation of atypical blood-vessels which arenot required by the part in which they are produced, and which con-stitute the essential tumor-tissue. The vascular spaces, whether capil-lary, venous, or arterial, are lined with endothelial cells the product ofthe angioblasts. In a growing angioma new blood-spaces continue toform, and again enter into communication with the older vascular spaces(Fig. 317). As the blood-spaces are formed by the production of an 444 PATHOLOGY AND TREATMENT OF TUMORS. intima from the angioblasts, active proliferation takes place in theremaining tissues of the vessel-wall. Connective tissue and muscle-. FiG. 317.—Angioma of the back : X no (Surgical Clinic, Rush Medical College, Chicago): a, wall of blood-spaces ; b, newly-formed blood-spaces. fibres derived from the pre-existing blood-vessels are produced, form-ing the outer and middle coats of the new vessels (Fig. 318). The
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectneoplas, bookyear1895
