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Pallister-Hall syndrome (PHS) is characterized by hypothalamic hamartoma, bifid epiglottis, and central or postaxial polydactyly. Familial transmission is autosomal dominant; isolated cases also occur. To screen for hypothalamic-pituitary dysfunction in PHS, we studied a 12 year-old boy (patient #1), and 14 additional patients (patients #2-14: 7M, 7F; ages 4-72 yr). We performed serial sampling of GH, LH/FSH, TSH, and cortisol from 20.00-08 00 h. At 08.00 h, we measured IGF-I, peak responses of LH and FSH after GnRH, and cortisol after ACTH. We found that 6/7 children, including patient #1, and 6/8 adults had low or absent spontaneous GH secretion and/or low levels of IGF-I. Patient #1 also had accelerated pubertal development, but no other patient had abnormalities of the pituitary-gonadal axis, and none of the 14 patients had an abnormal thyroid or adrenal axis. We conclude that decreased pituitary GH secretion is common in PHS, and may exist in the absence of other forms of endocrine dysfunction.

Evidence for Decreased Growth Hormone in Patients with Hypothalamic Hamartoma due to Pallister-Hail Syndrome