. A text-book of radiology . thoracic shadow ispleural or pulmonary provides a useful lesson indifferential diagnosis, and a few general rules may begiven to aid the student in arriving at a correct opinion. A pleural shadow is usually due to fluid, which may berecognised from what has just been said, and fluid tendsto displace the heart to the opposite side. A pulmonarylesion tends to draw the heart to the same side, and if nofluid is present the small wedge-shaped space between theouter end of the diaphragm and the chest wall remainsclear. Also we have to remember that fluid widens theinterc
. A text-book of radiology . thoracic shadow ispleural or pulmonary provides a useful lesson indifferential diagnosis, and a few general rules may begiven to aid the student in arriving at a correct opinion. A pleural shadow is usually due to fluid, which may berecognised from what has just been said, and fluid tendsto displace the heart to the opposite side. A pulmonarylesion tends to draw the heart to the same side, and if nofluid is present the small wedge-shaped space between theouter end of the diaphragm and the chest wall remainsclear. Also we have to remember that fluid widens theintercostal spaces, while pulmonary disease tends tonarrow them, giving the characteristic roof tileappearance. Emphysema gives an appearance of greater bright-ness than normal in the affected area, which brightness isnot increased on deep inspiration. The ribs are morehorizontal than usual, and the curve of the diaphragm isflattened or even depressed. The heart shadow shows upvery clearly and is more vertically placed. PLATE AN APPROXIMATELY NORMAL FEMALE ADULT CHEST. Taken on deep inspiration, thus bringing the heart more into the central line. The slightmarkings through the lungs are such as are always found in adult town-dwellers. PROPERTY OFVICTOR X-RAY CORPORATION PLATE III.
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