My son has been diagnosed with asthma maybe allergies. I've never gotten a true answer. Yesterday, we had some chest x-rays done on his chest. The results came back reading "bony structures normal. Aortic, hilar and cardiac outlines normal. Mild left retrocardiac plate-like atelectatic present. Right lung clear. No pleural effusion. Impression: minimal left retrocardiac plate-like atelectasis." the doctor didn't know what that meant. Can anyone please explain what this means and is it a serious condition we should worry about. The doctor is going to refer us to a specialist, but we must wait about a week before we see him. My son is only 5 years old. What do I do?