Educational objective: Non-pupil-sparing oculomotor nerve (CN | Uworld | Step 2ck

Educational objective: Non-pupil-sparing oculomotor nerve (CN Ill) palsies are concerning for aneurysmal compression. MR or CT angiography should be performed immediately. Pupil-sparing CN Ill palsies are most commonly caused by microvascular ischemia associated with diabetes mellitus, hypertension, and hyperlipidemia.