Pituitary apoplexy vs Subarachnoid hemorrhage
How to tell Pituitary apoplexy and Subarachnoid hemorrhage apart when a board question makes them look alike.
Pituitary apoplexy is thunderclap plus sellar mass, visual/ocular palsy, and hypopituitarism; SAH is thunderclap plus meningeal blood/xanthochromia.
Side by side
Sudden severe headache with visual field loss, ophthalmoplegia, altered mental status, and acute hypopituitarism from hemorrhage or infarction in a pituitary adenoma.
Thunderclap worst-headache presentation from bleeding into subarachnoid space, often aneurysmal, with meningismus, photophobia, vomiting, and xanthochromia.
Rapid expansion from pituitary tumor hemorrhage or infarction compresses optic chiasm, cavernous sinus structures, and pituitary tissue.
Ruptured aneurysm releases blood into CSF, irritating meninges and raising intracranial pressure.
Sellar mass with hemorrhage, acute adrenal insufficiency, low pituitary hormones, bitemporal hemianopia, or cranial nerve palsies support pituitary apoplexy.
Noncontrast CT or lumbar puncture showing subarachnoid blood or xanthochromia supports subarachnoid hemorrhage.
The trap
Both can present with sudden worst headache, so eye findings, pituitary failure, and CSF blood pattern decide.
The repair move
For thunderclap headache near endocrine content, look for sellar compression and pituitary failure before defaulting to aneurysm.
Try a free question
CoreA patient with a known pituitary macroadenoma develops sudden severe headache, bitemporal hemianopia, ophthalmoplegia, hypotension, and hemorrhage within the sella. Which diagnosis is most likely?
Show answer and explanation
Answer: A. Pituitary apoplexy. Sudden headache with hemorrhage in a pituitary adenoma, visual symptoms, and acute hypopituitarism supports pituitary apoplexy.
Why the other choices are tempting
- B. Subarachnoid hemorrhage causes blood in the subarachnoid space and meningeal irritation.
- C. Meningitis causes infectious meningeal inflammation with fever and CSF inflammatory findings.
- D. Migraine with aura does not explain sellar hemorrhage and hypopituitarism.
- E. Empty sella syndrome is a CSF-filled sella with flattened pituitary, not acute hemorrhage.
Flashcards
Tap a card to flip it.
What clue points to pituitary apoplexy?
Sudden headache with pituitary tumor hemorrhage, visual field loss, ophthalmoplegia, and hypopituitarism points to pituitary apoplexy.
What clue points to subarachnoid hemorrhage?
Thunderclap headache with meningeal signs and subarachnoid blood or xanthochromia points to SAH.
Quick answers
What is the fastest way to tell Pituitary apoplexy from Subarachnoid hemorrhage?
Pituitary apoplexy is thunderclap plus sellar mass, visual/ocular palsy, and hypopituitarism; SAH is thunderclap plus meningeal blood/xanthochromia.
What is the key clue for Pituitary apoplexy?
Sudden severe headache with visual field loss, ophthalmoplegia, altered mental status, and acute hypopituitarism from hemorrhage or infarction in a pituitary adenoma.
What is the key clue for Subarachnoid hemorrhage?
Thunderclap worst-headache presentation from bleeding into subarachnoid space, often aneurysmal, with meningismus, photophobia, vomiting, and xanthochromia.
What is the common trap with Pituitary apoplexy vs Subarachnoid hemorrhage?
Both can present with sudden worst headache, so eye findings, pituitary failure, and CSF blood pattern decide.