The right lower lobe is an anatomically defined portion of one’s lung. The right lung base usually encompasses the right lower lobe but may extend beyond that portion of lung. The answer to your question is that the radiologist is probably referring to the same location in both instances. A “lobulated nodular density….increased in size” (presumably increased in size in comparison to what a previous X-ray or CT showed) is of concern. It would be important to get assurance that this is the same nodule that is now described as “stable”.
If truly stable, that is good news, but you would be well advised to have a serious discussion with your physician about the implications of the current findings. Your physician should also be asked to clarify the opinion of the radiologist and that of a lung specialist (pulmonologist) if that type of specialist has been involved in these diagnostic efforts.
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