I want know how thymic shadows are produced

[Piano Doc]

I was studying SCID and got curious of the thymic shadow. I saw the radiograms on the google and I can see it is present as a sail sign
But I want to know how come this thymic shadow be produced? Thymic is anterior to the upper mediastinal part and the thymic shadow is present on the right of it..
I would appreciate if someone could give me a clear explanation.. btw it's my first year so don't go too hard..

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[Iso4ane]

I was studying SCID and got curious of the thymic shadow. I saw the radiograms on the google and I can see it is present as a sail sign
But I want to know how come this thymic shadow be produced? Thymic is anterior to the upper mediastinal part and the thymic shadow is present on the right of it..
I would appreciate if someone could give me a clear explanation.. btw it's my first year so don't go too hard..

Radiographs show the density between point A and B, and if there is a clear margins between two object (say between anterior and middle mediastinum and assuming one isn't super dense like a metal slab), you should still be able to see the outline of one of structures superimposed on the other.

http://pubs.rsna.org/doi/full/10.1148/rg.273065136 is a pretty cool article that explains medialstinal masses.

 

[charmiedermie]

I was studying SCID and got curious of the thymic shadow. I saw the radiograms on the google and I can see it is present as a sail sign
But I want to know how come this thymic shadow be produced? Thymic is anterior to the upper mediastinal part and the thymic shadow is present on the right of it..
I would appreciate if someone could give me a clear explanation.. btw it's my first year so don't go too hard..

 

[Piano Doc]

Radiographs show the density between point A and B, and if there is a clear margins between two object (say between anterior and middle mediastinum and assuming one isn't super dense like a metal slab), you should still be able to see the outline of one of structures superimposed on the other.

http://pubs.rsna.org/doi/full/10.1148/rg.273065136 is a pretty cool article that explains medialstinal masses.

Great. The article was clear enough! And I better improve some anatomy..lol I actually thought thymus was too small to get overlapped with pulmonary cavities. And if that were the case, it would be SCID🙂

 

[Piano Doc]

You are correct!! Except that radiograms produce white shadows🙂

 

[Iso4ane]

You are correct!! Except that radiograms produce white shadows🙂

Not if you invert it.

 

[NonTradJp]

Not if you invert it.

What about the old fashion film cassettes. No one key stroke inversion.