DAVID STEEL, M.D.
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In order to understand the changes in the cardiac silhouette under pathological conditions, it is, of course, quite necessary to know the normal. If you will bear with me for just a moment we will go over briefly the normal outline in the various positions.
On the right side in the A. P. position we notice usually two arches―the lower, larger arch being that of the right ventricle and the upper, less pronounced arch―that of the ascending portion of the aorta. In addition to these there can occasionally be distinguished two more. With a low diaphragm, and especially in the
STEEL D. The Mitral Heart Roentgenologically1. Ann Intern Med. ;1:302–304. doi: 10.7326/0003-4819-1-5-302
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Published: Ann Intern Med. 1927;1(5):302-304.
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