Modern surgery, general and operative . from the perithelial cells,which are between the capillaries and the perivascular lymph-spaces. Peri-thelioma is very malignant. 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 subcutane
Modern surgery, general and operative . from the perithelial cells,which are between the capillaries and the perivascular lymph-spaces. Peri-thelioma is very malignant. 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 timiors 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. 198), chondrosarcoma, gHosarcoma, and osteosarcoma. 10. Endotheliomata are tumors springing from the endothelium of lymph- Stengel, Text-Book of Fig .—Hansens case of cystic myxosarcomaof the orbit. Varieties of Sarcomata 427 spaces, and the name is retained no changes the growths ultimatelyundergo. Some writers have included under the term endothelioma psam-nioma, myxosarcoma, angiosarcoma, and plexiform sarcoma. Others considerendothelioma a special and characteristic form of sarcoma. Some would notconsider it with the sarcomata at all. The growth may take origin from theendothelium of the perivascular lymph-spaces, of the lymph-vessels, and ofthe great serous cavities (peritoneum, pleura, meninges).^ The characteristic?cell is the endothelial cell, usually known as the epithelioid cell. The structureof these tumors is very variable and depends upon the origin; some tumorsrecalling the original vascular network (American Text-Book of Pathology),others being distinctly alveolar. Many pathologists consider a psammoma ofthe dura to be an endothelioma with a fibrousstroma. A
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