Flattening of the diaphragm

Flattening of the diaphragm is the most sensitive sign on chest radiographs for the presence of hyperinflation of the lungs, usually due to emphysema 1-2.

The normal dome of each hemidiaphragm should rise at least 1.5cm above a line connecting the costophrenic angle posteriorly and sternophrenic angle anteriorly 1.


Chest x-ray
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Article Information

rID: 9201
System: Chest
Section: Approach
Synonyms or Alternate Spellings:
  • Flattened hemidiaphragms
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    Flattening of the...
    Figure 1: flattening of the diaphragm measurement
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    Marked hyperinfla...
    Case 1: marked hyperinflation
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