Journal
ENDOCRINE PATHOLOGY
Volume 21, Issue 2, Pages 135-138Publisher
HUMANA PRESS INC
DOI: 10.1007/s12022-009-9104-0
Keywords
Double pituitary adenoma; Medical therapy failure in prolactinoma
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Funding
- Jarislowsky and the Lloyd Carr-Harris Foundations
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Double pituitary adenomas are difficult to recognize pre-operatively as only a single mass may be appreciated on imaging. We present herein a giant prolactin-secreting pituitary adenoma in a middle-aged man that had responded partially to dopamine agonist therapy. The excised specimen demonstrated a double adenoma. The prolactin-producing one displayed the expected morphological changes resulting from medical therapy, while the other, a gonadotroph adenoma, did not. The failure of tumor shrinkage can be attributed to the presence of a double adenoma, a previously unreported cause of failure of medical therapy in prolactinoma.
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