Abstract
Acromegaly is caused by hypersecretion of growth hormone by the pituitary. There is some debate as to whether the primary etiology of the disease is abnormal hypothalamic stimulation of the pituitary or a primary pituitary tumor. This paper presents a case of acromegaly in which growth hormone dynamics in response to stimulation and suppression tests were abnormal. After transsphenoidal adenomectomy of a small tumor, growth hormone levels returned to normal and suppression and stimulation test results reverted to normal within 1 wk postoperatively and remained normal for 2 yr. The findings suggest that the acromegaly in this case was due to a primary pituitary dysfunction. Microsurgical removal of growth-hormone-secreting tumors provides a unique opportunity to study the etiology of acromegaly.
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