Diaphragmatic eventration

Dr Craig Hacking 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 a anteromedial portion of the right hemidiaphragm.

Radiographic features

Plain radiograph

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.

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

Differential diagnosis

Possible consderations on plain film includes

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Article Information

rID: 13370
System: Chest
Sections: Pathology, Gamuts
Synonyms or Alternate Spellings:
  • Eventration of the diaphragm
  • Diaphragm eventration
  • Eventration of diaphragm
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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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