Mitchell E. Geffner, MD

Disclosures

Cancer Control. 2002;9(3) 

In This Article

Potential Anterior Pituitary Hormone Deficiencies

In childhood hypopituitarism, GH is the most commonly underproduced pituitary hormone, often as the result of loss of hypothalamic GH-releasing hormone (GHRH) ( Table 2 ). The deficiency of GH primarily leads to short stature and slow height velocity. Untreated GH deficiency in children also causes disturbed body composition, with a reduction in lean body mass (ie, muscle) and an excess of fat, the latter accumulating predominantly in the cheeks of the face and in the abdomen, creating a cherubic or angel-like appearance.[17]

Deficiency of hypothalamic thyrotropin-releasing hormone (TRH) or pituitary TSH causes central hypothyroidism. Unlike children whose hypothyroidism is due to thyroid gland damage, those with hypopituitarism typically have somewhat higher thyroid hormone levels and thus may have few or no symptoms. In other cases, as occurs in patients with primary thyroid disease, short stature and slow height velocity, relative weight excess, constipation, dry skin, cold intolerance, and fatigue may be present.

Younger children with deficiencies of either hypothalamic gonadotropin-releasing hormone (GnRH) or the pituitary gonadotropins typically show no abnormalities since luteinizing hormone (LH) and follicle-stimulating hormone (FSH) levels are normally low prior to puberty. In contrast, adolescent-aged children with deficiencies of the gonadotropins present with failure to start or progress through puberty (breast development and menstrual periods in girls and enlargement of the testicles and penis in boys). Infrequently and paradoxically, central sexual precocity can be seen in the setting of hypopituitarism.

Loss of hypothalamic corticotropin-releasing hormone (CRH) or pituitary ACTH results in an ability of the adrenal zonas fasciculata and reticularis to manufacture normal amounts of cortisol (central adrenal insufficiency). If deficient, this hormone is most likely to place a child in a life-threatening situation. While there would likely be no symptoms under normal circumstances, except maybe mild fatigue, lack of cortisol in the setting of infection, fever, surgery, trauma, etc, may cause vomiting, dehydration, shock, and even death. Biochemical correlates of cortisol deficiency include hypoglycemia and hyponatremia (with normokalemia). In this setting, mineralocorticoid function is completely normal, as aldosterone production by the zona glomerulosa of the adrenal cortex is regulated by the renin-angiotensin and not the CRH-ACTH system.

Comments

3090D553-9492-4563-8681-AD288FA52ACE
Comments on Medscape are moderated and should be professional in tone and on topic. You must declare any conflicts of interest related to your comments and responses. Please see our Commenting Guide for further information. We reserve the right to remove posts at our sole discretion.

processing....