While it is not impossible for a lung metastasis to develop in the time span treatment takes, it isn't likely that one has since that first check. An x-ray and a CAT scan are similar but different. Computerized tomography still uses radiation to reveal what is going on, but instead of one image, it produces a series of images in layers, around 3mm apart. This gives the radiologist a series of cross-section "slices" through the area to examine; in some respects this could be considered a 3 dimensional view of things. CT

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.