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Journal of Clinical Endocrinology & Metabolism, Vol 80, 1577-1583, Copyright © 1995 by Endocrine Society
ARTICLES |
Y Greenman, K Tordjman, E Kisch, N Razon, G Ouaknine and N Stern
Institute of Endocrinology, Tel Aviv-Elias Sourasky Medical Center, Ichilov Hospital, Israel.
Pre- and postoperative anterior pituitary function was assessed in 26 subjects with nonfunctioning macroadenoma (NFMA) and in 15 acromegalic subjects with macroadenomas. Preoperatively, NFMA patients had a higher prevalence of secondary hypogonadism (78% vs. 40%; P < 0.05), hypothyroidism (23% vs. 0%; P = 0.06), and hypoadrenalism (43% vs. 7%; P = 0.02) compared to individuals with GH-secreting macroadenoma (GHMA). Patients with NFMA also had a higher prevalence of more severe pituitary failure compared with acromegalic patients; 56% of the patients in this group had more than one pituitary hormone axis impaired compared to only 8% in the acromegalic group. These differences could not be accounted for by tumor grade and/or stage. Transsphenoidal pituitary surgery led to a significant improvement in anterior pituitary function in the NFMA group. Nevertheless, the prevalence of pituitary deficiency postoperatively was still significantly greater in NFMA patients than in the acromegalic group (68% vs. 17%, respectively; P < 0.04). The results suggest that anterior pituitary function is better preserved in GHMA than in NFMA and that this difference is independent of tumor size. The mechanism underlying the lower rate of hypopituitarism in acromegalics with macroadenomas remains to be elucidated.
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