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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Mediastinal widening can be sen due to the enlarged lymph nodes there.
Also a tumor or mass can cause this.
Sometimes this can be a malignant growth.
Mostly not serious.
Also aneurysm of thoracic aorta is another possibility.
Hence you will need a CT scan of the chest for further evaluation.Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/