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 #Unilateral #Fixed #Dilated #Pupil #differential #diagnosis #neurology
