. Radiography and radio-therapeutics . Fig. 240. —Tumour of clavicle (Kadiograph by Dr. R. W. A. Salmond). Sarcoma of acromial end of clavicle. This has the appearance of acystic condition of the bone. It developed rapidly. 276 RADIOGRAPHY Acetabulum Rim of head. Carcinoma of Bone.—This is usually secondary to a primary focuselsewhere—in the breast, genito-urinary tract, etc. It is generally a latesecondary manifestation, the bones most frequently affected being the ster-num, ribs, and spine. The diseasemay also invade a large joint, orthe shafts of the long bones maybeco
. Radiography and radio-therapeutics . Fig. 240. —Tumour of clavicle (Kadiograph by Dr. R. W. A. Salmond). Sarcoma of acromial end of clavicle. This has the appearance of acystic condition of the bone. It developed rapidly. 276 RADIOGRAPHY Acetabulum Rim of head. Carcinoma of Bone.—This is usually secondary to a primary focuselsewhere—in the breast, genito-urinary tract, etc. It is generally a latesecondary manifestation, the bones most frequently affected being the ster-num, ribs, and spine. The diseasemay also invade a large joint, orthe shafts of the long bones maybecome involved. The sacrum oriliac bones may also be presence of these secondarydeposits is shown radiographicallyby rounded irregular shadows ofvarying density, generally lighterthan the normal bone. In othercases the disease takes the formof cario-necrosis, when cavitiesfilled with necrosed tissue are pro-duced, and appear on the screen orplate as well-marked areas. Whenexamined on a radiograph theseareas are darker, on the printthey appear as lighter —These showas projections, sometimesof normal bone tissue, andsometimes of rarefied orunusually dense bone ; thesituations in which theyare met with are numerous,as in the ends of the longbones,
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