A 55-year-old hypertensive man complains of acute headache on the left and is found to have a left Horner syndrome. What evaluation is necessary with Horner syndrome and how urgently should it be ...

[48,60] The infratrochlear nerve and medial palpebral artery pass through the medial fat pad. The medial palpebral artery is often transected during upper blepharoplasty and can cause hemorrhage.