Fig. 23-4. The cardiovascular shadow (of a "vertical" heart) in relation to the bony cage. Depending on posture and phase of respiration, the lower margin of the heart may be at a still lower level, as much as 5 cm below the xiphosternal joint (see fig. 23-5). See fig. 23-16 for the composition of the cardiovascular shadow. Click for high resolution image.

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