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Diaphragmatic eventration

Diaphragmatic eventration refers to an abnormal contour of the diaphragmatic dome and is typically due to incomplete muscularization 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 film

Elevation of the affected portion of the diaphragm is usually seen as a smooth hump on the normal contour of the hemidiaphragm.

Differential diagnosis

Possible consderations on plain film includes

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