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Background: The present study investigated the rates and the potential predictors of either new pituitary loss or recovery of hormonal function after transsphenoidal removal of a non-functioning pituitary adenoma. Methods: Patients who underwent transsphenoidal removal of a non-functioning pituitary adenoma from January 2003 to December 2007 at Ajou University Medical Center were included in this retrospective analysis. Patients were excluded if they had a history of previous pituitary tumor surgery, or did not have preoperative pituitary hormonal data. Results: Of 42 patients included in the analysis, 36 patients had hypopituitarism, 21 patients had "stalk compression" hyperprolactinemia, and 2 patients had normal pituitary function. At long term follow-up (longer than 6 months), 13 patients showed postoperative pituitary hormonal recovery in at least 1 hormonal axis, while 6 patients had developed postoperative hormonal loss in at least 1 hormonal axis. On analysis, neither preoperative serum prolactin level nor tumor size was related to postoperative pituitary hormonal changes. Conclusion: More than 1/3 of patients who underwent transsphenoidal surgery showed postoperative pituitary hormonal recovery. (J Korean Endocr Soc 24:181~188, 2009)

Pituitary Hormonal Changes after Transsphenoidal Tumor Removal in Non-Functioning Pituitary Adenoma