Good question: The diaphragm is mostly visible because it sits next to air filled lung, is a large muscle, and is seen on edge or en face. Intercostal muscles are small and not seen on edge. So, even though they sit next to air filled lung they are not conspicuous.
Answered 9/29/2016
3.5k views
Not dense enough: Intercostal muscles are not normally seen on chest xray. Their soft tissue density is not great enough. Details of muscles on plain radiographs are lacking. CT or MR show these soft tissues to much better advantage.
Answered 12/6/2014
3.5k views
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A doctor has provided 1 answer
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