Non-acquired combined pituitary hormone deficiencies without extrapituitary malformations

Non-acquired combined pituitary hormone deficiency (CPHD) without extrapituitary malformations is a group of rare genetic disorders characterized by the deficiency of two or more pituitary hormones due to abnormal development or function of the anterior pituitary gland, without associated structural abnormalities outside the pituitary region. This condition is also referred to as isolated combined pituitary hormone deficiency or familial combined pituitary hormone deficiency. The pituitary gland, located at the base of the brain, is the master endocrine gland that produces hormones regulating growth, metabolism, reproduction, and stress responses. In this condition, patients may lack growth hormone (GH), thyroid-stimulating hormone (TSH), adrenocorticotropic hormone (ACTH), gonadotropins (LH and FSH), and/or prolactin in various combinations. Key clinical features depend on which hormones are deficient and typically include short stature or growth failure (due to GH deficiency), hypothyroidism (due to TSH deficiency), adrenal insufficiency (due to ACTH deficiency), and delayed or absent puberty (due to gonadotropin deficiency). Neonatal presentations may include hypoglycemia, prolonged jaundice, micropenis in males, and in severe cases, life-threatening adrenal crisis. The condition is caused by mutations in transcription factor genes critical for pituitary development, including PROP1 (the most common genetic cause), POU1F1 (also known as PIT1), LHX3, LHX4, HESX1, and others. Unlike combined pituitary hormone deficiencies with extrapituitary malformations, patients with this form do not have associated brain midline defects, optic nerve abnormalities, or other organ malformations. Treatment involves lifelong hormone replacement therapy tailored to the specific deficiencies present. This may include recombinant growth hormone for GH deficiency, levothyroxine for TSH deficiency, hydrocortisone for ACTH deficiency, and sex steroids or gonadotropins for gonadotropin deficiency to induce puberty and maintain reproductive function. Early diagnosis and appropriate hormone replacement are essential to prevent serious complications such as growth failure, metabolic derangements, and developmental delays. Regular monitoring by an endocrinologist is necessary to adjust hormone doses throughout life. Genetic counseling is recommended for affected families.

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