A 58-year-old man with uncontrolled hypertension presents to the emergency department with sudden-onset severe retro-orbital headache, bilateral ptosis, and inability to adduct the right eye. On examination, he has bitemporal hemianopia and altered mental status. MRI of the brain shows a sellar mass with intrinsic T1 hyperintensity and compression of the optic chiasm, as marked **A** in the diagram. Which of the following is the most appropriate IMMEDIATE management step?

Explanation

## Why option 1 is correct The clinical presentation—thunderclap headache, ophthalmoplegia (CN III palsy with ptosis and adduction deficit), bitemporal hemianopia, and altered mental status—combined with the MRI finding of a sellar mass with intrinsic T1 hyperintensity (methemoglobin signal indicating acute hemorrhage) and chiasmal compression is pathognomonic for **pituitary apoplexy**. This is a neuroendocrine emergency caused by acute hemorrhage or infarction within a pre-existing pituitary adenoma, resulting in rapid expansion that compresses the optic chiasm, cranial nerves in the cavernous sinus, and residual pituitary tissue, leading to panhypopituitarism. The most critical and life-threatening consequence is acute secondary adrenal insufficiency (manifesting as hypotension, hyponatremia, and hypoglycemia). According to Harrison 21e Ch 380, **glucocorticoid replacement MUST be initiated immediately—before any other intervention, including levothyroxine or neurosurgery**—because initiating thyroid hormone without cortisol coverage can precipitate an adrenal crisis. The standard regimen is hydrocortisone 100–200 mg IV bolus followed by 50–100 mg IV every 6 hours (or dexamethasone 4 mg every 6 hours). This is the only option that reflects this critical principle. ## Why each distractor is wrong - **Option 2**: While levothyroxine and transsphenoidal decompression are important components of long-term management, levothyroxine must NEVER be started before glucocorticoid replacement. Initiating thyroid hormone in the setting of untreated adrenal insufficiency can unmask and worsen the adrenal crisis, causing cardiovascular collapse. Additionally, the timeline of "within 2 weeks" is too delayed; neurosurgical consultation should be urgent (within 7 days, ideally sooner if vision is deteriorating or consciousness is altered). - **Option 3**: Transsphenoidal decompression is indicated for progressive visual deterioration, severe field defects, or altered consciousness (all present in this patient), and neurosurgical consultation should be urgent. However, performing surgery without prior glucocorticoid replacement is dangerous—the patient will be in adrenal crisis intraoperatively and perioperatively, risking cardiovascular collapse and death. - **Option 4**: Desmopressin and testosterone are appropriate components of long-term panhypopituitary replacement, but they are not the immediate priority. Acute secondary adrenal insufficiency is the life-threatening emergency; cortisol must be replaced first. Waiting 24 hours to reassess is inappropriate when the patient has altered mental status and severe visual defects—this represents a medical and neurosurgical emergency. **High-Yield:** Pituitary apoplexy = thunderclap headache + ophthalmoplegia + bitemporal hemianopia + T1 hyperintense sellar mass; **GIVE HYDROCORTISONE FIRST, BEFORE LEVOTHYROXINE OR SURGERY**—this is the cardinal rule that saves lives. [cite: Harrison 21e Ch 380]