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irAE Hypophysitis — SCE Medical Oncology MCQ

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HardImmunotherapy & Targeted TherapyirAE HypophysitisSCE Medical Oncology

A patient on immunotherapy develops immune-related hypophysitis with secondary adrenal insufficiency and central hypothyroidism. Both cortisol and TSH are low. In what order should hormone replacement be initiated?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: BStart hydrocortisone first, then levothyroxine after cortisol replacement is established

When hypophysitis causes both adrenal and thyroid failure, give glucocorticoid replacement before levothyroxine. Thyroxine increases metabolic demand and cortisol clearance and can precipitate adrenal crisis in untreated cortisol deficiency. Once clinically stable on hydrocortisone, introduce thyroid replacement and assess the other pituitary axes.

Reference: https://www.nice.org.uk/guidance/conditions-and-diseases/cancer