. Radiography and radio-therapeutics . of bone. The term benign is used in relation to the degree of malignancy and growth rather than as a patho-logical classification. Many of these so-called benign growths are myeloid sarcomata, which are peculiarly slow in the rate of growth. The tumours most likely to lead to difficulty in diagnosis are those which are found in the interior of the shaft of a long bone, or at its epiphy-seal ends, and which have rare-fied or replaced the osseous or medullary tissue, with or without expanding the bone, and which are situated within theosseous tissue of theb
. Radiography and radio-therapeutics . of bone. The term benign is used in relation to the degree of malignancy and growth rather than as a patho-logical classification. Many of these so-called benign growths are myeloid sarcomata, which are peculiarly slow in the rate of growth. The tumours most likely to lead to difficulty in diagnosis are those which are found in the interior of the shaft of a long bone, or at its epiphy-seal ends, and which have rare-fied or replaced the osseous or medullary tissue, with or without expanding the bone, and which are situated within theosseous tissue of thebone. Such tumoursmay prove to be (1)central abscess, tuber-culous or septic; (2)gumma ; (3) hydatidcyst; (4) benign cyst;(5) fibrous osteitis ; (6)enchondroma ; (7) endo-thelioma; (8) secondarycarcinoma ; (9) mye-loma ; (10) sarcoma. The points to beconsidered are: (1)history; (2) physicalsigns; (3) evidence ofdisease or tumour inother parts of thebody ; (4) radiographicappearances, and a cor-The chief of these, so far as our purpose. Fig. 244.—Traumatic myositis ossificans. Note the unchanged aspect of the bone. The ossification in the muscle bundles is quite distinct from the periosteum. rect interpretation of these. 278 KADIOGRAPHY is concerned, is the radiographic appearances, though all should receiveattention. The points of importance radiographically are the site of the tumourin the bone, its density and consistence, whether subdivided by trabeculse,its outline, whether sharply defined and surrounded by a well-defined shellof bone, whether the bone around is normal or rarefied, presence of depositsof new periosteal bone or sclerosed bone, the presence of a fracture, theevidence of erosion of the bone. Traumatic Myositis Ossificans.—A condition which arises in the sub-stance of a muscle secondary to trauma. It occurs most frequently in thearm or the thigh. The appearances are characteristic and must not bemistaken for sarcoma arising from the periosteum. Fig. 244 illu
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