“…The causes of this interruption include tumour infiltration, compression by an aneurysm, iatrogenic causes, and traumatic injury [1]. Iatrogenic causes include central venous access, thyroidectomy, sympathetic ganglion blockade, carotid angiography, thoracic sympathectomy, highly positioned chest tubes, and various surgeries of the neck [5, 6]. Traumatic causes of Horner Syndrome include penetrating trauma, such as a stab or bullet wound, and blunt trauma of the neck and upper thorax.…”