A TSH SECRETING PITUITARY TUMOUR CAUSING HYPERTHYROIDISM: PRESENTATION OF A CASE AND REVIEW OF THE LITERATURE

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Abstract
A 45 yr old male with a 12 yr history of mild hyperthyroidism and a pituitary tumor is presented. He had clinical and laboratory evidence of hyperthyroidism and his serum TSH [thyrotropin] was persistently and markedly elevated. A TRH [thyrotropin-releasing hormone] test resulted in no further rise in serum TSH. No evidence of pituitary or peripheral endocrine deficiencies existed and prolactin levels were normal. Craniotomy was performed and a pituitary adenoma was removed. On light microscopy, it was mostly composed of chromophobes. Occasional granulated cells were observed, and on EM most of the cells contained fine granules, which suggested possible thyrotroph origin of the tumor. One week post-operatively the patient''s serum TSH returned to normal. Again, TRH produced no response in TSH. The patient became hypothyroid by clinical and laboratory findings and is currently on thyroid replacement therapy. The previously reported TSH secreting tumors associated with hyperthyroidism are reviewed.

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