PT - JOURNAL ARTICLE AU - Saadat Ali Saleemi AU - Ramesh Sahathevan TI - Horner’s syndrome secondary to internal carotid artery occlusion AID - 10.1136/bcr-2020-234973 DP - 2021 Feb 01 TA - BMJ Case Reports PG - e234973 VI - 14 IP - 2 4099 - http://casereports.bmj.com/content/14/2/e234973.short 4100 - http://casereports.bmj.com/content/14/2/e234973.full SO - BMJ Case Reports2021 Feb 01; 14 AB - Horner’s syndrome results from interruption of the sympathetic innervation to the eye. This interruption may occur at three anatomical levels along the sympathetic trunk pathway. There are numerous causes of Horner’s syndrome, including injury to the carotid artery, of which arterial dissection is the commonest pathology. Occlusive carotid disease secondary to atherosclerosis is a relatively rare cause of Horner’s syndrome. We describe a patient with Horner’s syndrome due to complete occlusion of the ipsilateral internal carotid artery.