. Radiography, X-ray therapeutics and radium therapy . of the digestive tract, the genito-urinary organs, or the bones, and, mostfrequently of all, cancer of the breast. The types most usually met with arein order of frequency : (1) scirrhus cancer ; (2) epithelioma, which may beprimary in the bronchial tract; (3) sarcoma ; (4) fibroma ; (5) enchondroma ;(6) osteoma (very rare). The lungs may also be involved in Hodgkinsdisease. The primary growth generally forms a large mass, which mayoccupy the greater part of the lung. It may by extension outwards involvethe parietal and visceral pleura. Th
. Radiography, X-ray therapeutics and radium therapy . of the digestive tract, the genito-urinary organs, or the bones, and, mostfrequently of all, cancer of the breast. The types most usually met with arein order of frequency : (1) scirrhus cancer ; (2) epithelioma, which may beprimary in the bronchial tract; (3) sarcoma ; (4) fibroma ; (5) enchondroma ;(6) osteoma (very rare). The lungs may also be involved in Hodgkinsdisease. The primary growth generally forms a large mass, which mayoccupy the greater part of the lung. It may by extension outwards involvethe parietal and visceral pleura. The tumour mass may necrose, and acavity result. The diffuse cancerous growth may resemble a tuberculouspneumonia. The metastatic growths are nearly always disseminated ; theymay vary from a miliary type to quite a large growth, and all variations insize may be met with in the same patient. The symptoms may be slightor marked according to the accessory lesions which accompany the newgrowth, such as pleurisy ; this may be dry or accompanied by PLATE XXXV.—Chests showing Pulmonary Tuberculosis. a, Post-mortem subject. Note fine shading in lung substance. Tuberculous broncho-pneumonia. b, Early tuberculosis of lungs, peribronchial thickening, irregularity of diaphragmatic shadow on right ith sharpness of all detail. Exposure ,,,,, second, intensifying screen Lcute general tuberculosis of both Lungs miliary tubercle). TUMOURS OF THE THORAX 197 Tumours of the Mediastinum.—Cancer is the most common form oftumour in the mediastinum. There are three chief points of origin : thethymus, the lymph glands, and the pleura and lungs. Primary sarcomais more frequent than primary cancer. Lympho-sarcoma and lymphadenomafrequently give rise to large tumours. Tumours of the (JEsopliagus.—The most common tumour is epithelioma,and it occurs more frequently in males than females. The middle or thelower third of the oesophagus is the most usual situation in which the growthis fo
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