. Radiography, x-ray therapeutics and radium therapy . shaft of a long bone, or at its epiphyseal ends, andwhich have rarefied or replaced the osseous or medullary tissue, with orwithout expanding the bone, and which are situated within the osseoustissue of the bone. Such tumours may prove to be (1) central abscess,tuberculous or septic ; (2) gumma ; (3) hydatid cyst; (4) benign cyst; 186 RADIOGEAPHY (5) fibrous osteitis ; (6) enchondroma ; (7) endothelioma ; (8) secondarycarcinoma ; (9) myeloma ; (10) sarcoma. The points to be considered are: (1) history; (2) physical signs; (3)evidence of di
. Radiography, x-ray therapeutics and radium therapy . shaft of a long bone, or at its epiphyseal ends, andwhich have rarefied or replaced the osseous or medullary tissue, with orwithout expanding the bone, and which are situated within the osseoustissue of the bone. Such tumours may prove to be (1) central abscess,tuberculous or septic ; (2) gumma ; (3) hydatid cyst; (4) benign cyst; 186 RADIOGEAPHY (5) fibrous osteitis ; (6) enchondroma ; (7) endothelioma ; (8) secondarycarcinoma ; (9) myeloma ; (10) sarcoma. The points to be considered are: (1) history; (2) physical signs; (3)evidence of disease or tumour in other parts of the body; (4) radiographicappearances, and a correct interpretation of these. The chief of these, sofar as our purpose is concerned, is the radiographic appearances, though allshould receive attention. 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 shell. Fig. 152.—Traumatic myositis ossificans. Note the unchanged aspect of the bone. The ossification in themuscle bundles is quite distinct from the periosteum. of 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. 152 illustratesthe typical appearances in this condition. Central abscess is generally accompanied by symptoms, however sHght,namely, pain and loss of power, indicating an inflammatory process, andoccasionally by fluctuations in temperature. Eadiographically, the cavityis not as a rule strictly central, and the surrounding dense bone is
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