. The heart and the aorta; studies in clinical radiology . diagnosis is more difficult. The followingtechnic seems necessary for a thorough examination. First, a complete radioscopic inspection of the thorax,which according to Holzknecht should be made in all thepositions: direct anterior, direct posterior oblique andabove all in right anterior oblique, noting the successivemodifications of the shadows in changing from one to theother of these positions. The combination of these movements aims to makevisible the different appearances of the aorta, to deter-mine whether its contours are regular
. The heart and the aorta; studies in clinical radiology . diagnosis is more difficult. The followingtechnic seems necessary for a thorough examination. First, a complete radioscopic inspection of the thorax,which according to Holzknecht should be made in all thepositions: direct anterior, direct posterior oblique andabove all in right anterior oblique, noting the successivemodifications of the shadows in changing from one to theother of these positions. The combination of these movements aims to makevisible the different appearances of the aorta, to deter-mine whether its contours are regular or not and toestimate the degree of density. In order to carry outthese procedures and to have an exact record of the out- ANEURISMS OF THE THORACIC AORTA 217 lines of the vessel, it is necessary to vary the angle ofthe rays and to bring the normal ray tangent to the entireextent of the artery outlines. After the examination on the screen, an orthodia-graphic tracing in the selective positions is taken as indi-cated by the preliminary radioscopic
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