Modern surgery, general and operative . s occur which are highly malignant. Angeiosarcoma may arise in theskin, in a serous membrane, in intermuscular structure, in bone, or in asalivary gland. It most frequently takes origin from a nevus. 8. Cylindroma, or Plexiform Sarcoma.—In this variety the sarcoma cellsadjacent to vessels have undergone hyaline or myxomatous degeneration; thecells distant from vessels are unchanged. Section shows the sarcoma cellsapparently contained in spaces with hyaline walls. These degenerative changesoccur most often in the angiosarcomata. Cylindromata arise from th
Modern surgery, general and operative . s occur which are highly malignant. Angeiosarcoma may arise in theskin, in a serous membrane, in intermuscular structure, in bone, or in asalivary gland. It most frequently takes origin from a nevus. 8. Cylindroma, or Plexiform Sarcoma.—In this variety the sarcoma cellsadjacent to vessels have undergone hyaline or myxomatous degeneration; thecells distant from vessels are unchanged. Section shows the sarcoma cellsapparently contained in spaces with hyaline walls. These degenerative changesoccur most often in the angiosarcomata. Cylindromata arise from the brain,salivary glands, lacrimal glands, and rarely from the subcutaneous growths are only moderately malignant.^ 9. Mixed tumors consist partly of mature and partly of embryonic tissue,the cellular elements exceeding the adult elements in amount. Among thesemixed tumors are fibrosarcoma or the recurrent fibroid tumor, myxosarcoma(Fig. 169), chondrosarcoma, gliosarcoma, and osteosarcoma. ^ Stengel, Text-Book of Fig. Hansens case of cystic myxosarcoma of theorbit. 374 Tumors or Morbid Growths lo. Endotheliomata are tumors springing from endothelium, and the nameis retained no matter what changes the growths ultimately undergo. Manywriters include under the term endothelioma psammoma, myxosarcoma,angiosarcoma, and plexiform sarcoma. Others consider endothelioma aspecial and characteristic form of sarcoma. Some would not consider it withthe sarcomata at all. The growth may take origin from the endotheliumof the blood-vessels and of the perivascular lymph-spaces, of the lymph-vessels, and of the great serous cavities (peritoneum, pleura, meninges).^The characteristic cell is the endothelial cell, usually known as the epithe-lioid cell. The structure of these tumors is very variable and depends uponthe origin; some tumors recalling the original vascular network (Ameri-can Text-Book of Pathology), others being distinctly alveolar. Manypathologists cons
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