Increased retrosternal airspace

Increased retrosternal airspace is an indicator of hyperinflation of the lungs and is usually due to emphysema.

The thickness of the space between the ascending aorta and the posterior margin of the sternum (3 cm inferior to the sternomanubrial joint) and is normally no more than 2.5 cm 1 although some authors say up to 4 cm may be normal 2.

See also


Chest x-ray
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Article Information

rID: 9202
System: Chest
Section: Approach
Synonyms or Alternate Spellings:

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    Retrostenal airsp...
    Figure 1: measurements of hyperinflation of the lungs
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    Marked hyperinfla...
    Case 1: marked hyperinflation
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    Case 2
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