Waiting for appointment with pulmonologist now Thank you for your advice!Chest x-rays, in general, are not very good at making the diagnosis of increased lung volumes. However, as was mentioned above, this "could" be a finding of obstructive lung disease. I would recommend getting an evaluation by a pulmonologist, preferably one with some diving knowledge. If your pulmonary function tests are normal and there are no blebs or other abnormalities on CT scan, you should be able to dive without restrictions. Just my 2 cents as a cardiologist (but not a pulmonologist)