Which one of the folloiwng hormonal level is decreased after Intracranial irradiation?: (A) Prolactin, (B) ACTH, (C) Growth hormone, (D) Gonadotropin
Answer is C. (C) Growth hormone # Endocrine dysfunction frequently follows exposure of the hypothalamus or pituitary gland to therapeutic radiation. Growth hormone is the pituitary hormone most sensitive to radiation therapy, and thyroid- stimulating hormone is the least sensitive; ACTH, prolactin, and the gonadotropins have an intermediate sensitivity.