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It means that the findings on your chest x-ray are subtle and hard to interpret with certainty. The apparent abnormalities could be real or just the result of a poor inspiration or poor x-ray technique. The first step is to have a repeat chest x-ray. This time take the deepest breath that you can. Then have the x-ray interpreted by a radiologist with lots of experience at interpreting chest x-rays. You should also ask your doctor if he/she hears any abnormal sounds coming from your lungs through the stethoscope, especially if these are in the area of the chest x-ray abnormality.
If the second chest x-ray is even slightly abnormal and/or the physical exam is abnormal, you should have a CT scan of the lungs. If this confirms abnormal shadows in your lungs, you may have to have a lung biopsy. You should also have pulmonary function tests performed as part of the evaluation of your shortness of breath.