Alright this is a little odd but my grandmother went in for surgery today to have a supposed tumor removed from her lung, but they found nothing. Yet during a ct scan there was something there. So the doctors explained that it must have been the diaphragm overlapping and casting a false shadow. But they didn't ellaborate on this subject and I have been searching high and low and can't figure out any details on a diaphragm (in the upper chest cavity) overlapping on itself. Any information would be great! Thanks