Hey, this is a little late, but if your chest has been growing, but you've been maintaining a weight, I would see an endocrinologist before you operation. I'm not sure how old you are, but it seems that most peoples gland stays about the same from when they get it, only changing appearance due to body fat. If you glad is continuing to change, there is probably an underlying condition causing it, so you should get that resolved before the operation to avoid recurrence.