- A 24-year-old man presented to the Emergency Department, Soroka University Medical Center, Beer-Sheva, Israel, with dyspnoea and left-sided chest pain. Examination of the chest showed signs of left pneumothorax and chest radiography confirmed the diagnosis. The patient was treated with thoracostomy on the left side. On the third postoperative day, a slight left upper lid ptosis was noticed. Two days later, the chest tube was removed but ptosis did not resolve. Horner's syndrome occurring in patients who have undergone chest tube insertion is a rare complication. Ophthalmologists and cardiothoracic surgeons need to be aware of this condition.