Diaphragmatic eventration

Dr Henry Knipe and Radswiki et al.

Diaphragmatic eventration refers to an abnormal contour of the diaphragmatic dome. It typically affects only a segment of the hemidiaphragm, compared to paralysis/weakness where the entire hemidiaphragm is typically affected. 

Diaphragmatic eventration is congenital in nature and due to incomplete muscularisation of the diaphragm with a thin membranous sheet replacing normal diaphragmatic muscle. Over time this region stretches and on inspiration does not contract normally. 

Frequently eventration is seen in the anteromedial portion of the right hemidiaphragm.

Elevation of the affected portion of the diaphragm is usually seen as a smooth hump, while the remainder of the hemidiaphragm contour is normal. The frontal X-ray may show a 'double' diaphragmatic contour, which is easily confirmed on the lateral projection.

  • maybe a sharp border between the eventrated portion and the remainder of the hemidiaphragm 4

Possible considerations on plain film include:

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Article information

rID: 13370
Synonyms or Alternate Spellings:
  • Eventration of the diaphragm
  • Diaphragm eventration
  • Eventration of diaphragm

Cases and figures

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    Case 1
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    Diaphragmatic eve...
    Case 2
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    Case 3: CT proven eventration
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    Case 4
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    Case 5: left-sided
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