These findings are artifacts of how the radiologic study is performed. Thus, since all the other cardiac tests have been normal, I doubt this chest x-ray result truly indicates your son has an enlarged heart. You shouldn't worry about this chest x-ray result and I think it would be fine to wait until your pediatrician returns to discuss the results. After you have this discussion, your pediatrician can refer you to sources of more information if necessary. I hope you find this information useful.
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