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I agree that you should have this evaluated as soon as possible. I can not of course give you any specific diagnosis. What you feel seems to be causing neurological symptoms which is concerning. It may include a possible benign type process such as a cyst ...perhaps with calcification but a malignant process could be of potential concern as well. I think you need expedited doctor visit and to be set up with a thoracic MRI....You may start by seeing your primary care doctor -- get set for appropriate diagnostic tests -- this would be best to get to point of diagnosing the lump that you feel and reason for symptoms that you have noticed
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Thank you and Best Regards,
Anthony Bray MD