Unfortunately, there is no way to predict what will happen over time with your cyst. Has your doctor inadicated that your cyst is complex? I am thinking that it probably is complex based on the findings you posted. So, I think you should talk to your doctor about your surgical options. Usually, cysts of that size do not go away on their own. Most do turn out to be benign. If it is removed, it should not have a great impact on your future health. It is very rare for cyst like these to be malignant. But, even if that is the case,you have the best odds of cure by finding it early.