My son recently had an xray, the first one he has had in a few years. His lungs were so big that they wouldn't fit on the xray machine! The dr offered no explanation or cause for alarm. He had gone in for heart palpatations and was fitted for a 24 hour Holter monitor. The monitor showed his heart rate going up and down in his sleep and they prescribed Atenelol to regulate his heart rhythm. I think they should have sent him to a lung AND heart specialist. He is 27 years old and hasn't had a complete checkup in several years. I am wondering if the enlarged lungs could be related to his heart problem, and also, I believe they should have tested further for possible causes of the arrythmia. If anyone has enlarged lungs but has NO other health problems, please respond. I have never heard of this. All comments are welcome.