. Radiography, x-ray therapeutics and radium therapy . Fig. 156.—Position of thorax for lateral obliqueposition, to show position of plate and source ofX-rays. This is a useful position for the examina-tion of the aorta, oesophagus, and mediastinum. Fig. 157.—Diagram to illustratethe appearance of thorax insemi-lateral position. the right or left of the centralshadow, limited by rounded,sharply-defined, and often pulsatingborders. The direction which thebulge takes may give an indicationof the position of the aneurism. Ashadow projecting to the right andlying nearer to the front than the back
. Radiography, x-ray therapeutics and radium therapy . Fig. 156.—Position of thorax for lateral obliqueposition, to show position of plate and source ofX-rays. This is a useful position for the examina-tion of the aorta, oesophagus, and mediastinum. Fig. 157.—Diagram to illustratethe appearance of thorax insemi-lateral position. the right or left of the centralshadow, limited by rounded,sharply-defined, and often pulsatingborders. The direction which thebulge takes may give an indicationof the position of the aneurism. Ashadow projecting to the right andlying nearer to the front than the back indicates an aneurism of the ascend-ing aorta, whereas a similar bulge to the left, and lying nearer the backthan the front, indicates the presence of an aneurism of the descendingaorta. There are other methods of detecting the position and origin of an aorticaneurism : (1) The tube may be moved from side to side or up and down. (2) The patient may be rotated, and observations made of the changein shape of the shadows as the patient moves. The si
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