Diaphragmatic eventration

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. 

Pathology

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. 

Location

Frequently eventration is seen in the 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.

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

Differential diagnosis

Possible considerations on plain film include:

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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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    Case 5: left-sided
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