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cardiothoracic ratio

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n.
The transverse diameter of the heart, as determined by x-ray examination, compared with that of the thoracic cage, used to help determine enlargement of the heart.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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