Horner syndrome localization
| Associated Symptoms | Consideration |
|---|---|
| Isolated, painful | Carotid dissection, cluster headache |
| Sensory level | Spinal cord |
| Arm numbness or weakness | Brachial plexus |
| Ipsilateral face and contralateral body numbness | Medulla |
| Sixth-nerve palsy | Cavernous sinus |