Abstract
The authors describe the case of a 54-year-old female with over a 10-year history of hyperthyroidism. Magnetic resonance images revealed a pituitary microadenoma and after transsphenoidal removal of this tumor, her signs and symptoms of hyperthyroidism almost completely disappeared. Pituitary tumors associated with TSH hypersecretion are rare, with only slightly over 100 cases having been thus far been reported. The authors have reviewed 103 of these TSH-secreting pituitary adenoma cases, and found that most of these tumors are macroadenomas and more than 1 cm in size. Thus, the case herein described is the first report of a TSH-secreting pituitary microadenoma that was detected by MRI.
