management of pituitary microadenomahemorrhagic pituitary microadenomaposterior pituitary microadenomapituitary microadenoma surgerypituitary microadenoma medicationmicroadenoma pituitary tumormicroadenoma of pituitary glandcystic pituitary microadenomamicroadenoma hypophysismicroadenoma tumorhemorrhagic microadenomamicroadenoma surgery