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Journal of Clinical Endocrinology & Metabolism, Vol 54, 1164-1168, Copyright © 1982 by Endocrine Society

ARTICLES

Effect of hypothalamic and pituitary irradiation on pubertal development in children with cranial tumors

R Rappaport, R Brauner, P Czernichow, E Thibaud, D Renier, JM Zucker and J Lemerle

The purpose of the present study was to report on gonadotropin function and puberty of a large group of children treated by cranial irradiation for cranial and neck tumors and medulloblastoma. Forty-five children of pubertal age were investigated. The mean interval time since radiation was 5 2/12 yr. Gonadotropin and gonadal function were evaluated by clinical criteria, plasma sex steroids, and plasma LH and FSH responses to LRH. Puberty was complete or progressing normally in 31 cases and was abnormal in 14 cases. Severe gonadotropin deficiency, with lack of or slow progression of puberty and decreased LH and FSH responsiveness to LRH, was observed in 5 cases; 2 of these had moderately elevated plasma PRL levels. Secondary amenorrhea or lack of pubertal progression was found in 5 other cases. GH deficiency was associated with gonadotropin deficiency in 9 of these 10 cases. Adrenal function, estimated by basal dehydroisoepiandrosterone, dehydroisoepiandrosterone sulfate, and estrone, was normal according to pubic hair stages. In conclusion, complete or partial gonadotropin deficiency can be the consequence of cranial irradiation in children receiving 6000 rads or less. It is usually associated with GH deficiency. The site of the damage on the pituitary gland or the hypothalamus remains to be demonstrated.


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