irAE Hypophysitis — SCE Medical Oncology MCQ
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Correct answer: B — Start 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