Feline Hyposomatotropism Study Guide
Overview and Clinical Importance
Hyposomatotropism (also called pituitary dwarfism) is an extremely rare feline endocrinopathy characterized by a primary deficiency of growth hormone (GH) and a secondary deficiency of insulin-like growth factor-1 (IGF-1). While much more commonly documented in dogs (particularly German Shepherd dogs), only a handful of cases have been reported in cats in the veterinary literature.
Understanding the somatotropic axis, GH physiology, and the clinical manifestations of GH deficiency is essential for recognizing this rare condition. Although individual questions on feline hyposomatotropism are uncommon on the NAVLE, understanding the underlying endocrine physiology and being able to differentiate dwarfism from other causes of failure to thrive is frequently tested.
Pathophysiology
The Somatotropic Axis
Growth hormone (GH), also called somatotropin, is produced by somatotroph cells in the anterior pituitary gland (adenohypophysis). GH secretion is regulated by two hypothalamic hormones:
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