. A radiographic atlas of the pathologic changes of bones and joints . ubstance resembling unorganized granulation tissue which couldbe easily scooped out. The pathologists report was giant cell sar-coma. This type of sarcoma, the myelogenous or medullary giant cell,is prone to develop cysts in bone, and these cysts are oftenfilled with blood and comprise the so-called bone aneurisms. Theabsence of cystic cavities and pigmentation, the result of degene-rative changes and hemorrhagic extravasation and of calcifiedplates so gjsnerally found in the other types of osteo-sarcoma,account for the abs
. A radiographic atlas of the pathologic changes of bones and joints . ubstance resembling unorganized granulation tissue which couldbe easily scooped out. The pathologists report was giant cell sar-coma. This type of sarcoma, the myelogenous or medullary giant cell,is prone to develop cysts in bone, and these cysts are oftenfilled with blood and comprise the so-called bone aneurisms. Theabsence of cystic cavities and pigmentation, the result of degene-rative changes and hemorrhagic extravasation and of calcifiedplates so gjsnerally found in the other types of osteo-sarcoma,account for the absence of the characteristic appearance men-tioned above. -78- PLATE XXV. SARCOMA OF THE SOFT PARTS OF THE THIGH—NO INVOLVMENT OF THE FEMUR —X-RAY FINDING CONFIRMED BY A CAREFUL EXAMINATION OF THE LIMB AFTER A HIP AMPUTATION. The dark mottled shadow surrounding the femur and seen more espe-cially behind that bone is a sarcomatous tumor of the soft parts of thethigh. The bone is not involved. Its normal outline can be distinctly made out through the PLATE XXV. •8o — PLATE XXVI. OSTEO-SARCOMA OF THE UPPER END OF THE HUMERUS—SECONDARY INVOLVE-MENT OF THE SOFT PARTS. The upper extremity of the humerus is enormously enlarged, and itsnormal structure is replaced by the characteristic appearance of osteo-sarcoma. The disease has perforated the thin, bony envelope encasing the tumornotably on the inner and outer borders, and in these places it invades thesoft parts; its outline is lost, and its shadow blends with that of the lattertissues. The shoulder joint is not involved.
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