Thank you so much for your reply. The problem is that I don't understand what the difference between the cm value in the old MRI which was only two values when the new MRI, which is in mm has three values. Please forgive my stubborn ignorance! I can determine the speed of two vehicles prior to a collision using a graphing calculator but simple math is impossible to me. Did the cyst get bigger between 2012 and last week? I can get a picture of what 3.1 x 1.6 cm looks like as far as size but the three values is messing with my radar. Lol