Unilateral Fixed Dilated Pupil - Differential Diagnosis Framework
If Altered Mental Status - Consider Oculomotor (3rd cranial nerve) Palsy:
 • Brain (uncal) herniation, lntracranial hypertension, lntracranial hemorrhage, SAH, tumor
 • Posterior communicating artery aneurysm (Compression)
If no neurological cause, consider:
 • Trauma
 • Medication effects
 • Congenital abnormalities

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