If a pituitary tumor is found close to the stalk, what else can it cause besides raising prolactin? is it dangerous for it to be there?

Yes it can be danger: Pituitary tumors can lead to one of many complications depending on their size and functional behavior. Most of them produce prolactin for which there is good medical treatment. But the tumor can start growing in size in the future, which can lead to obstruction of the CSF(fluid in and around the brain) which is called Hydrocephlous and causes further neurological impairment unless treated properl