Retrosternal airspace

Dr Andrew Dixon et al.

The retrosternal airspace is seen as a normal lucency between the posterior aspect of the sternum and anterior aspect of the ascending aorta on lateral chest radiographs. This space normally measures less than 2.5 cm in width. Increased retrosternal airspace is a sign of pulmonary emphysema, while obliteration of the retrosternal airspace is an indication of an anterior mediastinal mass.  

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Article information

rID: 18963
System: Chest
Section: Approach
Tag: chest, cxr, refs
Synonyms or Alternate Spellings:

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Cases and figures

  • Case 1: normal
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  • Marked hyperinfla...
    Case 2: increased in emphysema
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  • Case 3: obliterated in lymphoma
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