cardiothoracic ratio
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English
[edit]![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Cardiothoracic_ratio.jpg/220px-Cardiothoracic_ratio.jpg)
Noun
[edit]cardiothoracic ratio (plural cardiothoracic ratios)
- (medicine) The ratio (MRD + MLD) / ID, where MRD is the greatest perpendicular diameter from midline to right heart border; MLD is the greatest perpendicular diameter from midline to left heart border; and ID is the internal diameter of the chest at the level of the right hemidiaphragm.