@SZapper - I think with any type of image labeling, having something to associate the image with is helpful.
I'm kind of disturbed that a pituitary gland can actually shrink! However, I am interested to hear that a empty sella can cause infertility. I have a friend who has been trying to get pregnant recently, with little success. If her doctor doesn't find anything at her next visit, I'm going to suggest she have her doctor consider empty sella as a possibility.