Congenital hypopituitarism associated with neonatal hypoglycemia and microphallus: four cases secondary to hypothalamic hormone deficiencies.

The Journal of Pediatrics
R D LovingerM M Grumbach

Abstract

The association of hypoglycemia and microphallus in the male neonate is presumptive evidence of congenital hypopituitarism. This was observed in four male infants with normal birth weight and length, optic discs, and intelligence, and without gross central nervous system malformations. Plasma and urinary cortisol values were low. Stimulation with metyrapone and insulin hypoglycemia failed to elicit a rise in plasma corticoids, but multiple doses of ACTH evoked a response. Growth hormone responses to arginine, insulin, sleep, L-dopa, and glucagon were uniformly less than 2.5 ng/ml. In three patients, however, length remained within 2 SD of the mean until two years of age; in one, there was a sharp decrease in growth by three months. Two patients had low plasma TSH and thyroxine concentrations within the first month of life. In the other two patients, whose thyroxine levels were measurable, intravenous administration of thyrotropin-releasing factor evoked a normal rise in plasma TSH; serum thyroxine decreased into the hypothyroid range in one after GH therapy was initiated. Plasma prolactin was normal in the first two patients receiving thyroxine replacement therapy. The other two patients had elevated baseline prolactin levels a...Continue Reading

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