This is Dr. David
a chest CT scan is much more detailed and 3D high definition imaging of your chest
a chest xray is 1940s 2 dimensional projections of your chest which uses xrays to cast shadows onto flat films.
any sort of mediastinal shadow can cast funny and suggest a possible mass lesion which is not really there .
I would trust the chest CT scan
let me know if you have other questions.
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