ArticleFrontiers in veterinary science2026
Case Report: Treatment of hypersomatotropism in a diabetic dog with transsphenoidal hypophysectomy.
Article in Frontiers in veterinary science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Pituitary somatotroph adenoma is rare in dogs and may cause hypersomatotropism (HS) leading to insulin resistance and diabetes mellitus (DM). Case description: A 10-year-5-month-old neutered male Staffordshire Bull Terrier presented with polyuria, polydipsia, progressive inspiratory stridor, and poorly controlled DM with hyperinsulinemia and insulin resistance. Serum insulin-like growth factor (IGF-1) was markedly elevated (1,214 ng/mL; reference interval, 42-449 ng/mL) and suggested HS which was further supported by a somatostatin suppression test. Magnetic resonance and computed tomography (CT) imaging revealed a pituitary mass, organomegaly, and arthropathy. Treatment and outcome: The pituitary mass was removed by transsphenoidal hypophysectomy. Immunohistochemistry confirmed a growth hormone (GH)-producing pituitary adenoma. Postoperatively, GH normalized within hours, and IGF-1 values within a week. Although HS resolved and hyperinsulinemia improved postoperatively, the dog remained dependent on insulin and DM persisted which eventually led to euthanasia of the dog about 9 and a half months post-operatively. Conclusion: Transsphenoidal hypophysectomy was effective in normalization of GH and IGF-1 concentrations in a dog diagnosed with a pituitary somatotroph adenoma but the postoperative course was characterized by persistent insulin dependency and DM.
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