. Radiography and radio-therapeutics . •^^ Fig. 237.—Sarcoma of lower end of bone lias been sawn longitudinally in order to show thetumour in its interior. The appearance of this tumour inthe amputated limb and in the living subject are shown inPlate XLVI., Figs, c, e, and/. TUMOURS OF BONE The periosteal type of sarcoma is not at all easy to distinguish,appear as a decided shadow ofabout the density of the softparts, arising from the surface ofthe bone. It involves the soft 275 It may. Fig. -Chomlro-sarcoma of lowerend of tibia. Fig. 239.—Sarcoma at upper end of humerus. Thisi
. Radiography and radio-therapeutics . •^^ Fig. 237.—Sarcoma of lower end of bone lias been sawn longitudinally in order to show thetumour in its interior. The appearance of this tumour inthe amputated limb and in the living subject are shown inPlate XLVI., Figs, c, e, and/. TUMOURS OF BONE The periosteal type of sarcoma is not at all easy to distinguish,appear as a decided shadow ofabout the density of the softparts, arising from the surface ofthe bone. It involves the soft 275 It may. Fig. -Chomlro-sarcoma of lowerend of tibia. Fig. 239.—Sarcoma at upper end of humerus. Thisis a form of periosteal sarcoma which rapidlyinvolved the soft parts. Kadiographically, thehumerus showed very faint in-egularity at theperiphery with thickening of the bone. structures, extending into them in some instances,show thickening, whichwill be revealed radio-graphically. Myeloid sarcoma inits least malignant formmay simulate a cyst ofthe bone. It is of slowgrowth, and occurs atthe ends of long fracturemay occur in this asin cystic disease. Hydatid cyst mayalso be met with. Itis more chronic in itsprogress, and shows awell-defined, fairlyregular outline. The periosteum may
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