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.
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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.
Elevation of the affected portion of the diaphragm is usually seen as a smooth hump, while the remainder of the hemidiaphragm contour is normal.
- may be a sharp border between eventrated portion and the remainder of the hemidiaphragm 4
Possible consderations on plain film includes
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- 4. Nason LK, Walker CM, McNeeley MF et-al. Imaging of the diaphragm: anatomy and function. Radiographics. 2012;32 (2): E51-70. doi:10.1148/rg.322115127 - Pubmed citation