I have pituitary tumor.
My doctor told me that 10% of all people may have pituitary tumor, but pituitary tumors are in different type such as PRL, GH, TSH, ACTH...that may cause different hormone disturbance. Some type of pituitary tumor is not allowed to do the surgery (which I believe is the ACTH one?), as you will start to lose weight by taking medicine to control hormone.
Mine was neither of the above types, it is just a tumor that is nonfunctional. I think you have to do a lot of blood tests to ensure which type of pituitary tumor you have.