Just a little inside knowledge when it comes to repeat radiological studies. Sometimes the real reason for a repeat scan is because a different radiologist is reading on that day. Not my intention to call anyone out, because I know from experience that very subtle changes can be very easily misread and/or overlooked. From a legality standpoint things can get very muddy when it comes to what should or shouldn't have been seen on certain films. Reading scans at times it isn't as black and white as a lay person would like to believe. As to life, there is quite a bit of grey area.