La pathologie et le traitement chirurgical des tumeurs . Fig. 398.—Partie de la cordage spinale avec psammoma (après Sutton). SARCOME. 551 l'histoire de tous ces cas a été l'un des paralysisand progressifs lents. Métamorphoses régressives.—l'absence d'un réticulum bien développé, la grande activité proliférante des cellules et l'atypicalvascularisation du sarcome rendent la tumeur responsable de changements dégénératifs précoces et exten. La dégénérescence graisseuse est courante, mais la calci-fication n'est observée que dans le psammoma. Le détritus granulaire dans la fattydégénérescence est absorbé ou, par l'ajout de s

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The pathology and surgical treatment of tumors . Fig. 398.—Portion of the spinal cordwith psammoma (after Sutton). SARCOMA. 551 history of all such cases has been one of slow progressive paralysisand death. Regressive Metamorphoses.—The absence of a well-developedreticulum, the great proliferating activity of the cells, and the atypicalvascularization of sarcoma render the tumor liable to early and exten-sive degenerative changes. Fatty degeneration is common, but calci-fication is only observed in psammoma. The granular detritus in fattydegeneration is either absorbed or, by the addition of serum, remainsas a turbid fluid which occupies spaces surrounded by tumor-tissue, forming cysts without a proper cyst-wall. The imperfect development of the walls of blood-vessels is thecause of frequent hemorrhages into the substance of the tumor, wherethe blood either coagulates, is absorbed, or remains in a fluid state. jmKm ? , -*;-:, T-^/./- X. Fig. 399.-Myxomatous degeneration in sarcoma; X 75 (Surgical Clinic, Rush Medical College, Chicago):a, connective-tissue stroma ; i, b, sarcoma-cells ; c, c, c, myxomatous tissue. The staining of the tissues of the tumor in the vicinity of rupturedcapillaries is one of the characteristic features of most of the sarcoma-tous growths. The liability to hemorrhage is increased by the exten-sion of fatty degeneration to the capillary walls. If the hemorrhage iscopious, the tumor-tissue is compressed by the extravasated blood, and 552 PATHOLOGY AND TREATMENT OF TUMORS. a blood-cyst forms, which frequently adds to the difficulty in diagnosis.The sudden increase in the size and tension of the tumor should leadto the suspicion that a free hemorrhage has taken place into the sub-stance of the tumor. In subcutaneous sarcomata this accident is oftenannounced a day or two later by discoloration of the skin. Hyalinedegeneration is not as frequently observed in sarcoma as in carcinoma.Myxomatous deg

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• bookcentury1800
• bookdecade1890
• booksubjectneoplas
• bookyear1895